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.

SICP PDF with Texinfo and LaTeX source

Cluster SSH - Cluster Admin Via SSH

ack is a grep-like search tool optimized for source code.

cpanminus - get, unpack, build and install modules from CPAN

Bundler or pip freeze for Perl

A distributed issue tracker; upstream is now http://gitorious.org/prophet

A improved implementation of scriptreplay

Dovecot tools

Search mailboxes for a particular email