Vim-like editing in Eclipse
PDF Library for Developers
Calculations in a text document
automatic indexing for large LaTex documents
Generate charts and reports using data gathered in log files
jsvim 4: xvi online
General-Purpose PDF Library for Java and .NET
Edit the OCR text layer of DjVu documents in a web browser
Collaborators on a version-controlled .tex file can track changes.
Add readings and translations to Japanese text
Literate Programming in pure Python
A stand-alone PHP-only library for parsing BBCode-like tags
FCKeditor (retired)