MySQLTuner is a script written in Perl that will assist you with your MySQL configuration and make recommendations for increased performance and stability.

Hosting git repositories -- Gitolite allows you to setup git hosting on a central server, with very fine-grained access control and many (many!) more powerful features.

Free Communications For Everyone.

Free Libre command-line tools for Kindle development

My fork of longkey for linux, the original projects seems not in maintain anymore, I am still trying to contact the author...