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Eric Hellman
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### Index
* [Bash](#bash)
* [C](#C)
* [C++](#c-1)
* [Clojure](#clojure)
* [Data Science](#data-science)
* [Git](#git)
* [HTML / CSS](#html--css)
* [Java](#Java)
* [JavaScript](#javascript)
* [jQuery](#jquery)
* [Vue.js](#vuejs)
* [Kubernetes](#Kubernetes)
* [Language Translations](#language-translations)
* [Markdown](#markdown)
* [MongoDB](#mongodb)
* [Perl](#Perl)
* [Python](#python)
* [Ruby](#ruby)
* [SQL](#sql)
### Bash
* [Bash Scripting cheatsheet](https://devhints.io/bash) Devhints (HTML)
### C
* [C Reference Card (ANSI)](https://users.ece.utexas.edu/~adnan/c-refcard.pdf) (PDF)
* [The C Cheat Sheet: An Introduction to Programming in C](https://sites.ualberta.ca/~ygu/courses/geoph624/codes/C.CheatSheet.pdf) - Andrew Sterian (PDF)
### C++
* [C++ Quick Reference](https://www.hoomanb.com/cs/quickref/CppQuickRef.pdf) (PDF)
### Clojure
* [Clojure Cheatsheet](http://clojure.org/cheatsheet)
### Data Science
* [Cheatsheets for Data Scientists](https://www.datacamp.com/community/data-science-cheatsheets) - Datacamp (PDF)
### Git
* [Git Cheat Sheet](https://education.github.com/git-cheat-sheet-education.pdf) - GitHub (PDF)
* [GitHub Cheat Sheet](https://github.com/tiimgreen/github-cheat-sheet) - Tim Green (Markdown)
### HTML / CSS
* [CSS CheatSheet](https://htmlcheatsheet.com/css/) (HTML)
* [CSS Flexbox Cheatsheet](https://css-tricks.com/snippets/css/a-guide-to-flexbox/) - Chris Coyier (HTML)
* [CSS Grid Cheatsheet](https://css-tricks.com/snippets/css/complete-guide-grid/) - Chris House (HTML)
* [HTML CheatSheet](https://htmlcheatsheet.com) (HTML)
### Java
* [Java](https://programmingwithmosh.com/wp-content/uploads/2019/07/Java-Cheat-Sheet.pdf) (PDF)
### JavaScript
* [JavaScript Cheatsheet](https://www.codecademy.com/learn/introduction-to-javascript/modules/learn-javascript-introduction/cheatsheet) - Codecademy (HTML)
* [JavaScript CheatSheet](https://htmlcheatsheet.com/js/) (HTML)
* [JavaScript Regex Cheatsheet](https://www.debuggex.com/cheatsheet/regex/javascript) - Debuggex (HTML)
* [JavaScript WorldWide Cheatsheet](https://cheatography.com/davechild/cheat-sheets/javascript/) - Cheatography (JavaScript)
#### jQuery
* [jQuery CheatSheet](https://htmlcheatsheet.com/jquery/) (HTML)
#### Vue.js
* [Vue Essential Cheatsheet](https://www.vuemastery.com/pdf/Vue-Essentials-Cheat-Sheet.pdf) - Vue Mastery (PDF)
### Kubernetes
* [Handy Cheat Sheet for Kubernetes Beginners](https://kubernetes.io/docs/reference/kubectl/cheatsheet/) - Kubernetes Documentation: kubectl Cheat Sheet
### Language Translations
* [Swift and C# Quick Reference - Language Equivalents and Code Examples](http://www.globalnerdy.com/wordpress/wp-content/uploads/2015/03/SwiftCSharpPoster.pdf) - Globalnerdy (PDF)
### Markdown
* [Markdown Here](https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet) - Adam Pritchard
### MongoDB
* [Quick Cheat Sheet for Mongo DB Shell commands](https://gist.github.com/michaeltreat/d3bdc989b54cff969df86484e091fd0c) - Michael Treat's Quick Cheat Sheet
### Perl
* [Perl Reference card](https://michaelgoerz.net/refcards/perl_refcard.pdf) (PDF)
### Python
* [Comprehensive Python Cheat Sheet for Beginners](https://medium.com/the-codehub/comprehensive-python-cheat-sheet-for-beginners-5d76bb038fa2)
* [Comprehensive Python Cheatsheet](https://gto76.github.io/python-cheatsheet) - Jure Šorn (HTML)
* [Learn Python in Y minutes](https://learnxinyminutes.com/docs/python/)
* [Python Cheat Sheet](https://websitesetup.org/python-cheat-sheet/)
* [Python Cheatsheet for beginners](https://www.codecademy.com/learn/learn-python-3/modules/learn-python3-syntax/cheatsheet) - Codeacademy (HTML)
* [Python Crash Course Cheatsheet](https://ehmatthes.github.io/pcc/cheatsheets/README.html) - Eric Matthes (HTML)
* [Python for Data Science Cheatsheet](https://pydatascience.org/data-science-cheatsheets/) - DataCamp (HTML and Image)
* [Python Regex Cheatsheet](https://www.debuggex.com/cheatsheet/regex/python) - Debuggex (HTML)
* [Python WorldWide Cheatsheet](https://cheatography.com/davechild/cheat-sheets/python/) - Cheatography (Python)
### Ruby
* [Ruby Cheat Sheet](https://www.codeconquest.com/wp-content/uploads/Ruby-Cheat-Sheet-by-CodeConquestDOTcom.pdf) - CodeConquest.com (PDF)
### SQL
* [MySQL Cheatsheet](https://s3-us-west-2.amazonaws.com/dbshostedfiles/dbs/sql_cheat_sheet_mysql.pdf) - Database Star (PDF)
* [PostgreSQL Cheatsheet](https://s3-us-west-2.amazonaws.com/dbshostedfiles/dbs/sql_cheat_sheet_pgsql.pdf) - Database Star (PDF)

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### Index
* [Ada](#ada)
* [Android](#android)
* [Bash](#bash)
* [C](#c)
* [C#](#c-sharp)
* [C++](#c-1)
* [Clojure](#clojure)
* [Cloud Computing](#cloud-computing)
* [CoffeeScript](#coffeescript)
* [Dart](#dart)
* [Erlang](#erlang)
* [Git](#git)
* [GLSL](#glsl)
* [Go](#go)
* [Haskell](#haskell)
* [HTML / CSS](#html--css)
* [Bootstrap](#bootstrap)
* [Java](#java)
* [JavaScript](#javascript)
* [Angular.js](#angularjs)
* [jQuery](#jquery)
* [React](#react)
* [Kotlin](#kotlin)
* [Language Agnostic](#language-agnostic)
* [Operating Systems](#operating-systems)
* [LaTeX](#latex)
* [Lisp](#lisp)
* [MATLAB](#matlab)
* [Node](#node)
* [NoSQL](#nosql)
* [Objective-C](#objective-c)
* [Ocaml](#ocaml)
* [PHP](#php)
* [Python](#python)
* [Ruby](#ruby)
* [Rust](#rust)
* [Scala](#scala)
* [SQL](#sql)
* [Vim](#vim)
### Ada
* [Introduction to Ada](https://learn.adacore.com/courses/intro-to-ada/index.html)
### Android
* [Javatpoint Android Tutorial](https://www.javatpoint.com/android-tutorial)
### Bash
* [Help messages will explain everything](https://explainshell.com)
* [Learn Shell Programming](http://www.learnshell.org)
### C
* [Learn C](http://www.learn-c.org)
### C Sharp
* [C# Tutorial](https://www.w3schools.com/cs) - W3Schools
* [Codeasy](https://codeasy.net/course/csharp_elementary)
* [Learn C#](http://www.learncs.org)
* [Learn C#](https://www.codecademy.com/learn/learn-c-sharp) - Codecademy
### C++
* [C++ Tutorial](https://www.w3schools.com/cpp) - W3Schools
* [CppKoans](https://github.com/torbjoernk/CppKoans)
### Clojure
* [4Clojure - Koans](http://www.4clojure.com)
* [Clojure Koans](http://clojurekoans.com)
* [ClojureScript Koans](http://clojurescriptkoans.com)
* [Try Clojure](http://www.tryclj.com)
### Cloud Computing
* [AWS API Gateway](https://run.qwiklabs.com/focuses/269?catalog_rank=%7B%22rank%22%3A3%2C%22num_filters%22%3A1%2C%22has_search%22%3Atrue%7D&parent=catalog&search_id=3605949) - *registration required*
* [AWS Identity and Access Management (IAM)](https://run.qwiklabs.com/focuses/7782?catalog_rank=%7B%22rank%22%3A6%2C%22num_filters%22%3A1%2C%22has_search%22%3Atrue%7D&parent=catalog&search_id=3605942) - *registration required*
* [AWS Lambda](https://run.qwiklabs.com/focuses/6431?catalog_rank=%7B%22rank%22%3A2%2C%22num_filters%22%3A1%2C%22has_search%22%3Atrue%7D&parent=catalog&search_id=3605949) - *registration required*
* [AWS Simple Storage Service (S3)](https://run.qwiklabs.com/focuses/7860?catalog_rank=%7B%22rank%22%3A3%2C%22num_filters%22%3A0%2C%22has_search%22%3Atrue%7D&parent=catalog&search_id=3597563) - *registration required*
* [Google Cloud Platform](https://cloud.google.com/training/free-labs/)
### CoffeeScript
* [Coffeescript Style Guide](https://github.com/polarmobile/coffeescript-style-guide/blob/master/README.md)
* [Smooth CoffeeScript, Interactive Edition](http://autotelicum.github.io/Smooth-CoffeeScript/interactive/interactive-coffeescript.html)
### Dart
* [Dart Official Codelabs](https://dart.dev/codelabs)
### Erlang
* [Try Erlang](http://www.tryerlang.org)
### Git
* [git-game](https://github.com/git-game/git-game)
* [git-game-v2](https://github.com/git-game/git-game-v2)
* [Githug](https://github.com/Gazler/githug) (Tutorial in shell)
* [Learn Git Branching](https://learngitbranching.js.org)
* [Learn Git with Bitbucket Cloud](https://www.atlassian.com/git/tutorials/learn-git-with-bitbucket-cloud)
* [Try Git](http://try.github.io)
### GLSL
* [The Book of Shaders](https://thebookofshaders.com)
### Go
* [Go Koans](https://github.com/cdarwin/go-koans)
* [The Go Tutorial](http://tour.golang.org)
### Haskell
* [Try Haskell!](http://tryhaskell.org)
### HTML / CSS
* [CSS Diner](http://flukeout.github.io)
* [CSS Tutorial](https://www.w3schools.com/css/) - W3Schools
* [Flexbox Defense](http://flexboxdefense.com)
* [Flexbox Froggy](http://flexboxfroggy.com)
* [FreeCodeCamp: Responsive Web Design Course](https://www.freecodecamp.org/learn/responsive-web-design/basic-html-and-html5/)
* [Grid Garden](https://cssgridgarden.com)
* [HTML Tutorial](https://www.w3schools.com/html/) - W3Schools
* [Learn by doing beginner projects](https://dash.generalassemb.ly)
* [Learn HTML & CSS interactively](https://www.codecademy.com/learn/web)
* [Prototyping a professional website](https://www.codecademy.com/learn/make-a-website)
#### Bootstrap
* [Front End Libraries: Bootstrap](https://www.freecodecamp.org/learn/front-end-libraries/bootstrap)
### Java
* [CodingBat code practice](http://codingbat.com/java)
* [Java at Codecademy](https://www.codecademy.com/courses/learn-java)
* [Java Tutorial](https://www.w3schools.com/java) - W3Schools
* [Learn Java](http://www.learnjavaonline.org)
* [Learneroo Java tutorial](https://www.learneroo.com/modules/11)
### JavaScript
* [ABC of JavaScript : An Interactive JavaScript Tutorial](http://www.openjs.com/tutorials/basic_tutorial/)
* [Codecademy jquery track](https://www.codecademy.com/learn/jquery)
* [ES6 Interactive Guide](http://stack.formidable.com/es6-interactive-guide/#/)
* [Functional Programming in Javascript](https://github.com/ReactiveX/learnrx)
* [JavaScript Algorithms and Data Structures Certification](https://www.freecodecamp.org/learn/javascript-algorithms-and-data-structures/basic-javascript)
* [Javascript interactive tutorial on CodeCademy](https://www.codecademy.com/learn/javascript)
* [JavaScript interactive tutorial on CoderMania](http://www.codermania.com/javascript/lesson/1a/hello-world)
* [JavaScript Tutorial](https://www.w3schools.com/js) - W3Schools
* [Javascripting](https://github.com/sethvincent/javascripting)
* [Learn JavaScript](http://www.learn-js.org)
* [Learn knockout.js](http://learn.knockoutjs.com)
* [Learn to Code for Free – Grasshopper](https://grasshopper.app)
* [Learning Advanced JavaScript](http://ejohn.org/apps/learn/)
* [Try jQuery](http://try.jquery.com)
#### Angular.js
* [Angular Basics](http://www.angularjsbook.com)
* [Angular Tutorial](https://www.w3schools.com/angular/) - W3Schools
* [AngularJS - Step by Logical Step](http://nicholasjohnson.com/angular-book/)
* [egghead.io: Learn AngularJS with Tutorial Videos & Training](https://egghead.io)
* [Learn AngularJS with free interactive lessons](http://www.learn-angular.org)
#### jQuery
* [Front End Libraries: jQuery](https://www.freecodecamp.org/learn/front-end-libraries/jquery)
#### React
* [Front End Libraries: React](https://www.freecodecamp.org/learn/front-end-libraries/react)
* [React Tutorial](https://react-tutorial.app)
### Kotlin
* [Kotlin tutorial](https://kotlinlang.org/docs/tutorials/)
### Language Agnostic
* [CodeCombat](http://codecombat.com) - Python, JavaScript, CoffeeScript, Clojure, Lua, Io
* [Codility](https://codility.com/programmers/)
* [Introduction to the Coding Interview Prep Algorithms](https://www.freecodecamp.org/learn/coding-interview-prep/algorithms) (freeCodeCamp)
* [Python Tutor](http://pythontutor.com) - Python, Java, JavaScript, TypeScript, Ruby, C, C++
* [The Fullstack Tutorial for GraphQL](https://www.howtographql.com)
#### Operating systems
* [Learning operating system development using Linux kernel and Raspberry Pi](https://github.com/s-matyukevich/raspberry-pi-os) - Sergey Matyukevich (:construction: *in process*)
### LaTeX
* [Learn LaTeX in 30 minutes](https://www.overleaf.com/learn/latex/Learn_LaTeX_in_30_minutes)
### Lisp
* [Lisp Koans](https://github.com/google/lisp-koans)
### MATLAB
* [Interactive Tutorials for MATLAB, Simulink, Signal Processing, Controls, and Computational Mathematics](http://www.mathworks.com/tutorials)
### Node
* [Node School](http://nodeschool.io)
* [Node.js Tutorial](https://www.w3schools.com/nodejs) - W3Schools
### NoSQL
* [MongoDB Koans](https://github.com/chicagoruby/MongoDB_Koans)
* [Try Redis](http://try.redis.io)
### Objective-C
* [Try Objective-C](http://tryobjectivec.codeschool.com)
### Ocaml
* [Try Ocaml](http://try.ocamlpro.com)
### PHP
* [CodeCademy PHP](https://www.codecademy.com/learn/php)
* [Learn PHP](http://www.learn-php.org)
* [PHP tutorial](https://www.w3schools.com/php) - W3Schools
### Python
* [Codecademy Python course](https://www.codecademy.com/learn/python)
* [How to Think Like a Computer Scientist: Learning with Python, Interactive Edition](http://interactivepython.org/courselib/static/thinkcspy/index.html)
* [Learn Python](http://www.learnpython.org)
* [Learn Python Step by Step](http://www.techbeamers.com/python-tutorial-step-by-step)
* [Python for Everybody - Interactive](https://runestone.academy/runestone/books/published/py4e-int/index.html) - Barbara Ericson
* [Python Koans](https://github.com/gregmalcolm/python_koans)
* [Python Pandas Tutorial: A Complete Introduction for Beginners](https://www.learndatasci.com/tutorials/python-pandas-tutorial-complete-introduction-for-beginners/) - George McIntire, Brendan Martin, Lauren Washington
* [Python Tutorial](https://www.w3schools.com/python) - W3Schools
### Ruby
* [CodeCademy Ruby](https://www.codecademy.com/learn/ruby)
* [Ruby Koans](http://www.rubykoans.com)
* [The Odin Project](http://www.theodinproject.com)
* [Try Ruby](http://tryruby.org)
### Rust
* [Rustlings](https://github.com/rust-lang/rustlings)
### Scala
* [A Tour of Scala - an interactive scala tutorial](https://scalatutorials.com/tour/)
* [Scala Exercises](https://www.scala-exercises.org)
### Selenium
* [Selenium Tutorial - Web Automation](http://www.techbeamers.com/selenium-webdriver-tutorial)
### SQL
* [Intro to SQL: Querying and managing data](https://www.khanacademy.org/computing/computer-programming/sql) - Khan Academy
* [SQL at Codecademy](https://www.codecademy.com/courses/learn-sql)
* [SQL Tutorial](https://www.w3schools.com/sql) - W3Schools
* [SQLBolt](http://sqlbolt.com)
### Vim
* [Interactive Vim Tutorial](http://www.openvim.com/tutorial.html)

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### Index
* [Git](#git)
* [Python](#Python)
* [SQL](#SQL)
* [Веб-разработка](#Веб-разработка)
### Git
* [Интерактивное обучение работе с git](https://githowto.com/ru)
### Python
* [Pythontutor](https://pythontutor.ru)
### SQL
* [SQL упражнения](https://www.sql-ex.ru/?Lang=0)
### Веб-разработка
* [Open source воркшопы](https://nodeschool.io/ru)
* [Учитесь веб-разработке бесплатно!](http://codenamecrud.ru)

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### Index
* [Dart](#dart)
### Dart
* [DartPad](https://dartpad.cn)

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### Index
* [Angular](#angular)
* [ClojureScript](#clojurescript)
* [Crystal](#crystal)
* [CSS](#css)
* [Dart](#dart)
* [Docker](#docker)
* [Elm](#elm)
* [Flutter](#flutter)
* [GDScript](#gdscript)
* [Git](#git)
* [Go](#go)
* [Haskell](#haskell)
* [Ionic](#ionic)
* [Java](#java)
* [JavaScript](#javascript)
* [Kotlin](#kotlin)
* [Kubernetes](#kubernetes)
* [.Net](#dotnet)
* [Node.js](#nodejs)
* [OCaml](#ocaml)
* [Perl](#perl)
* [PHP](#php)
* [Python](#python)
* [R](#r)
* [React](#react)
* [Redis](#redis)
* [Ruby](#ruby)
* [Rust](#rust)
* [RxJS](#rxjs)
* [Scala](#scala)
* [SQL](#sql)
* [Svelte](#svelte)
* [Swift](#swift)
* [TypeScript](#typescript)
### Angular
* [Plunker](http://plnkr.co)
* [StackBlitz](https://stackblitz.com/fork/angular)
### ClojureScript
* [Replumb REPL](https://clojurescript.io)
* [Web REPL](http://clojurescript.net)
### Crystal
* [Compile & run code in Crystal](https://play.crystal-lang.org/#/cr)
### CSS
* [CodePen](https://codepen.io)
* [CSSdeck](http://cssdeck.com)
* [CSSdesk](http://cssdesk.com)
* [Dabblet](http://dabblet.com)
* [Flexy Boxes](http://the-echoplex.net/flexyboxes/)
### Dart
* [DartPad](https://dartpad.dev)
### Docker
* [Katakoda](https://www.katacoda.com/courses/docker/playground)
* [Play with Docker](https://labs.play-with-docker.com)
### Elm
* [Ellie](https://ellie-app.com)
* [Try Elm!](https://elm-lang.org/try)
### Flutter
* [Codepen](https://codepen.io/topic/flutter/templates)
* [Flutter Studio](https://flutterstudio.app)
### GDScript
* [GDScript](https://gdscript-online.github.io)
### Git
* [Git](https://learngitbranching.js.org/?NODEMO)
### Go
* [Go Playground](https://play.golang.org)
### Haskell
* [Try Haskell](https://www.tryhaskell.org)
### Ionic
* [StackBlitz](https://stackblitz.com/fork/ionic)
### Java
* [repl.it](https://repl.it) (_including a separate Java/Swing_)
* [SoloLearn](https://code.sololearn.com/#java)
### JavaScript
* [CodePen](https://codepen.io)
* [CodeSandbox.io](https://codesandbox.io)
* [Esfiddle](https://esfiddle.net)
* [JSBin](http://jsbin.com)
* [JSFiddle](http://jsfiddle.net)
* [Plunker](http://plnkr.co)
* [SoloLearn](https://code.sololearn.com/#html)
### Kotlin
* [Kotlin](https://play.kotlinlang.org)
* [Kotlin Playground](https://developer.android.com/training/kotlinplayground)
### Kubernetes
* [Katakoda](https://www.katacoda.com/courses/kubernetes/playground)
* [Play with Kubernetes](https://labs.play-with-k8s.com)
### <a name="dotnet"></a>.NET
* [.NET Fiddle](https://dotnetfiddle.net)
### NodeJS
* [Ideone](http://ideone.com)
### OCaml
* [Try OCaml](https://try.ocamlpro.com)
### Perl
* [Perl](http://tryperl.pl)
### PHP
* [Codepad](http://codepad.org)
* [ExtendsClass](https://extendsclass.com/php.html)
* [PHPFiddle](http://phpfiddle.org)
* [PHPTester](http://phptester.net)
### Python
* [Codepad](http://codepad.org)
* [Python Trinket](https://trinket.io/python)
* [Python.org Shell](https://www.python.org/shell)
* [Repl.it - NiceDualPoin](https://repl.it/repls/NiceDualPoint#main.py)
* [SoloLearn](https://code.sololearn.com/#py)
### R
* [R-Fiddle](http://www.r-fiddle.org)
* [Rextester](https://rextester.com/l/r_online_compiler)
### React
* [CodeSandbox.io](https://codesandbox.io)
* [jscomplete](https://jscomplete.com/playground)
* [StackBlitz](https://stackblitz.com/fork/react)
### Redis
* [Try Redis](https://try.redis.io)
### Ruby
* [Codepad](http://codepad.org)
* [Sololearn](https://code.sololearn.com/#rb)
* [TryRuby](https://try.ruby-lang.org)
### Rust
* [Rust Playground](http://play.integer32.com)
### RxJS
* [StackBlitz](https://stackblitz.com/fork/rxjs)
### Scala
* [ScalaFiddle.io](https://scalafiddle.io)
* [ScalaFiddle.net](http://scalafiddle.net)
* [Scastie](https://scastie.scala-lang.org)
### SQL
* [Extends Class](https://extendsclass.com/sqlite-browser.html)
* [SQLFiddle](http://sqlfiddle.com)
### Svelte
* [StackBlitz](https://stackblitz.com/fork/svelte)
* [Svelte REPL](https://svelte.dev/repl)
### Swift
* [Online Swift Playground](http://online.swiftplayground.run)
### TypeScript
* [Playground](https://www.typescriptlang.org/play/index.html)
* [StackBlitz](https://stackblitz.com/fork/typescript)

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### Index
* [Competitive Programming](#competitive-programming)
* [CTF Capture the Flag](#capture-the-flag)
* [Data science](#data-science)
* [Information security](#information-security)
* [Problem Sets](#problem-sets)
### Competitive Programming
* [4Clojure](http://www.4clojure.com)
* [A2 Online Judge](https://a2oj.com)
* [AtCoder](https://atcoder.jp)
* [Binary Search](https://binarysearch.com)
* [Caribbean Online Judge](http://coj.uci.cu)
* [COCI](https://hsin.hr/coci/)
* [Codeabbey](http://www.codeabbey.com)
* [Codechef](https://www.codechef.com/contests)
* [Codecombat](https://codecombat.com)
* [Codeeval](https://www.codeeval.com)
* [CodeFights](https://codefights.com)
* [Codeforces](http://codeforces.com/contests)
* [Codeground](https://www.codeground.org)
* [Coderbyte](https://coderbyte.com)
* [Codewars](http://www.codewars.com)
* [Codingame](https://www.codingame.com/start)
* [DMOJ](https://dmoj.ca)
* [E-olymp](https://www.e-olymp.com/en/)
* [Facebook Hackercup](https://www.facebook.com/hackercup)
* [Google Code Jam](https://codingcompetitions.withgoogle.com/codejam)
* [Google Kickstart](https://codingcompetitions.withgoogle.com/kickstart)
* [HackerEarth](https://www.hackerearth.com)
* [Hackerrank](https://www.hackerrank.com)
* [Internet Problem Solving Contest](http://ipsc.ksp.sk)
* [Just another Golf Coding](http://jagc.org)
* [Kattis](https://open.kattis.com)
* [LeetCode](https://leetcode.com)
* [Microcorruption](https://microcorruption.com/login)
* [oj.uz](https://oj.uz)
* [Sphere Online Judge](http://www.spoj.com/contests)
* [Techgig](https://www.techgig.com)
* [Topcoder](https://www.topcoder.com)
* [Toph](https://toph.co)
* [URI Online Judge](https://www.urionlinejudge.com.br/judge/en/login)
### Capture the flag
* [CTFlearn](https://ctflearn.com) (email adress *requested*)
* [Google Ctf](https://capturetheflag.withgoogle.com) (email adress *requested*)
* [Hacker101](https://ctf.hacker101.com) (email adress *requested*)
* [Hackthebox](https://www.hackthebox.eu) (email adress *requested*)
* [Overthewire Wargames fungame to practice CTF](https://overthewire.org/wargames/bandit)
* [Picoctf](https://picoctf.org/resources) (email adress *requested*)
* [TryHackMe](https://tryhackme.com) (email adress *requested*)
### Data science
* [AIcrowd](https://www.aicrowd.com)
* [CodaLab](https://competitions.codalab.org)
* [CrowdANALYTIX](https://www.crowdanalytix.com/community)
* [DrivenData](https://www.drivendata.org)
* [Kaggle](https://www.kaggle.com)
* [KDD Cup](https://www.kdd.org/kdd2019/kdd-cup)
### Information security
* [ångstromCTF](https://angstromctf.com)
* [CTFtime](https://ctftime.org)
* [Hacker101](https://ctf.hacker101.com)
* [InCTF](https://inctf.in)
### Problem Sets
* [500 Data structures and algorithms interview questions and their solutions in C++](https://www.quora.com/q/techiedelight/500-Data-Structures-and-Algorithms-interview-questions-and-their-solutions)
* [A2 Online Judge](https://a2oj.com/ps)
* [Advent Of Code](http://adventofcode.com)
* [Anarchy Golf](http://golf.shinh.org)
* [CareerCup](http://www.careercup.com)
* [CheckIO](http://www.checkio.org)
* [Codeforces](http://codeforces.com/problemset)
* [Codility](https://codility.com/programmers/)
* [Coding Bat](http://codingbat.com/java)
* [CSES Problem Set](https://cses.fi/problemset/)
* [Exercism](http://exercism.io)
* [Geeks For Geeks](http://www.geeksforgeeks.org)
* [Google Code Jam - Practise](https://code.google.com/codejam/contests.html)
* [Hacker.org](http://www.hacker.org)
* [HackerEarth](https://www.hackerearth.com)
* [HDU Online Judge](http://acm.hdu.edu.cn)
* [Interactive Coding Challenge](https://github.com/donnemartin/interactive-coding-challenges)
* [InterviewBit](https://www.interviewbit.com)
* [Kattis](https://open.kattis.com)
* [Leetcode](https://leetcode.com)
* [Mathproblem of the Month - Bilkent University](http://www.fen.bilkent.edu.tr/~cvmath/prob-month.html)
* [PEG Judge](http://wcipeg.com)
* [PKU Online Judge](http://poj.org)
* [Ponder This!](https://www.research.ibm.com/haifa/ponderthis/index.shtml)
* [Practice Python](https://www.practicepython.org)
* [ProblemBook.NET](https://github.com/AndreyAkinshin/ProblemBook.NET)
* [Project Euler](https://projecteuler.net)
* [Python Practice Projects](http://pythonpracticeprojects.com)
* [Rosalind](http://rosalind.info/problems/locations/)
* [Sphere Online Judge](http://www.spoj.com/problems/classical)
* [TalentBuddy](http://www.talentbuddy.co/blog/)
* [Timus Online Judge](http://acm.timus.ru)
* [URI Online Judge](https://www.urionlinejudge.com.br/judge/login)
* [UVa Online Judge](https://uva.onlinejudge.org/index.php?Itemid=8&option=com_onlinejudge)