FCKeditor (retired)
Stanford CoreNLP, a Java suite of core NLP tools
Open/Libre Office extension for converting eBooks in fb2 format
Java based XSLT Processor extension for syntax highlighting
Vim-like editing in Eclipse
Text expander(auto-type) application
Word processor oriented for learning difficulties.
Chordpro editor that can display, transpose and print song sheets.
TEI produces the TEI Guidelines and associated software
General-Purpose PDF Library for Java and .NET
Modest natural-language processing