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.

Perl extensions for the rxvt-unicode terminal emulator

Monitoring plugin to check HAProxy with Icinga, Nagios and other compatible monitoring solutions