diff --git a/README.md b/README.md
index 8e67165..7fb5133 100644
--- a/README.md
+++ b/README.md
@@ -280,7 +280,7 @@ _Everything that simplifies interactions with the database._
 - [Speedment](https://github.com/speedment/speedment) - Database access library that utilizes Java 8's Stream API for querying.
 - [sql2o](https://www.sql2o.org) - Thin JDBC wrapper that simplifies database access and provides simple mapping of ResultSets to POJOs.
 - [Vibur DBCP](https://www.vibur.org) - JDBC connection pool library with advanced performance monitoring capabilities.
-- [Xodus](https://jetbrains.github.io/xodus/) - Highly concurrent transactional schema-less and ACID-compliant embedded database.
+- [Xodus](https://github.com/JetBrains/xodus) - Highly concurrent transactional schema-less and ACID-compliant embedded database.
 
 ### Date and Time
 
@@ -344,7 +344,7 @@ _Distributed transactions provide a mechanism for ensuring consistency of data u
 - [Atomikos](https://www.atomikos.com) - Provides transactions for REST, SOA and microservices with support for JTA and XA.
 - [Bitronix](https://github.com/bitronix/btm) - Simple but complete implementation of the JTA 1.1 API.
 - [Narayana](https://narayana.io) - Provides support for traditional ACID and compensation transactions, also complies with JTA, JTS and other standards. (LGPL-2.1-only)
-- [Seata](https://seata.io) - Delivers high performance and easy to use distributed transaction services under a microservices architecture.
+- [Seata](https://github.com/seata/seata) - Delivers high performance and easy to use distributed transaction services under a microservices architecture.
 
 ### Distribution
 
@@ -445,7 +445,7 @@ _Everything about high-performance computation, from collections to specific lib
 - [fastutil](http://fastutil.di.unimi.it) - Fast and compact type-specific collections.
 - [HPPC](https://labs.carrotsearch.com/hppc.html) - Primitive collections.
 - [JCTools](https://github.com/JCTools/JCTools) - Concurrency tools currently missing from the JDK.
-- [Koloboke](https://koloboke.com) - Hash sets and hash maps.
+- [Koloboke](https://github.com/leventov/Koloboke) - Carefully designed extension of the Java Collections Framework with primitive specializations and more.
 
 ### HTTP Clients
 
@@ -468,7 +468,7 @@ _Libraries that handle serialization to hypermedia types._
 
 - [hate](https://github.com/blackdoor/hate) - Builds hypermedia-friendly objects according to HAL specification.
 - [JSON-LD](https://github.com/jsonld-java/jsonld-java) - JSON-LD implementation.
-- [Siren4J](https://github.com/eserating/siren4j) - Library for the Siren specification.
+- [Siren4J](https://github.com/eserating-chwy/siren4j) - Library for the Siren specification.
 
 ### IDE
 
@@ -625,12 +625,10 @@ _Everything else._
 
 - [CQEngine](https://github.com/npgall/cqengine) - Ultra-fast, SQL-like queries on Java collections.
 - [Design Patterns](https://github.com/iluwatar/java-design-patterns) - Implementation and explanation of the most common design patterns.
-- [Failsafe](https://github.com/jhalterman/failsafe) - Simple failure handling with retries and circuit breakers.
 - [FF4J](https://github.com/ff4j/ff4j) - Feature Flags for Java.
 - [FizzBuzz Enterprise Edition](https://github.com/EnterpriseQualityCoding/FizzBuzzEnterpriseEdition) - No-nonsense implementation of FizzBuzz made by serious businessmen for serious business purposes. (No explicit license)
 - [J2ObjC](https://github.com/google/j2objc) - Java-to-Objective-C translator for porting Android libraries to iOS.
 - [JavaCV](https://github.com/bytedeco/javacv) - Java interface to OpenCV, FFmpeg, and more.
-- [JavaX](http://javax.botcompany.de) - Reinventing and extending Java with a focus on simplicity. (No explicit license)
 - [JBake](https://jbake.org) - Static website generator.
 - [JBot](https://github.com/rampatra/jbot) - Framework for building chatbots. (GPL-3.0-only)
 - [JCuda](http://jcuda.org) - JCuda offers Java bindings for CUDA and CUDA-related libraries.