GUI for translate-shell, the cli tool for quick translation
'Category Theory for Programmers' unofficial PDF and LaTeX source
From finding text to search and replace
Open-source automated grading of programming assignments
A free universal Braille Transcriber
Text translation proportional length checker
Plaggie is a standalone open source plagiarism detection application
A PHP program that creates maths basic facts quizzes.
Content Authoring Tool for OLPC English Literacy Tool