Update README.md

Added Document Processing and two libraries for Microsoft and OpenOffice.

README.md

@@ -13,6 +13,7 @@ A curated list of awesome Java frameworks, libraries and software. Inspired by [
     - [Development](#development)
     - [Distributed Applications](#distributed-applications)
     - [Distribution](#distribution)
+    - [Document Processing](#document-processing)
     - [GUI](#gui)
     - [Game Development](#game-development)
     - [High Performance](#high-performance)
@@ -122,6 +123,13 @@ A curated list of awesome Java frameworks, libraries and software. Inspired by [
 * [packr](https://github.com/libgdx/packr#packr) - Packs your JAR, assets and JVM for native distribution on Windows, Linux and Mac OS X.
 * [Bintray](https://bintray.com/) - Version control for your binaries which handles the publishing. Can also be used with Maven or Gradle.
 
+## Document Processing
+
+*Libraries that assist with processing document formats wether they are Microsoft or an open standard.*
+
+* [Apache POI](http://poi.apache.org/) - Supports OOXML (e.g XLSX, DOCX, PPTX) as well as OLE2 (e.g. XLS, DOC or PPT).
+* [jOpenDocument](http://www.jopendocument.org/) - Processes the OpenDocument format.
+
 ## GUI
 
 *Libraries to create modern graphical user interfaces.*