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.

A fast PostgreSQL Log Analyzer

rc file (dotfile) management

Utility functions for working with IP addresses in Openresty

Advanced WAL File Management Tools for PostgreSQL

Roboo - HTTP Robot Mitigator

A set of plugins for monitoring nginx with Munin

General two level cache (lrucache + shared dict)