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.

Nikto web server scanner

A fast PostgreSQL Log Analyzer

Sensible database change management

A multi-language port of Browserscope's user agent parser.

Single Packet Authorization > Port Knocking

Bucardo multimaster and master/slave Postgres replication

Query Performance Monitoring Tool for PostgreSQL

PostgreSQL Automatic Failover: High-Availibility for Postgres, based on Pacemaker and Corosync.

The SSLMate Client - Buy and Manage SSL Certs from the Command Line