Anti-Spam SMTP Proxy Server implements multiple spam filters
Database Replication, Filtered Synchronization, and Transformation
Web based system for Computer Assisted Telephone Interviewing (CATI)
Automatic persistent logbooks for Linux shell sessions (bash, tcsh...)
Simple open source php based HTML5 rich web chat system
an 'auto-reply' bot for your mail server
The IRC's Talking Robot
Auto-Downloading Course Manager for BITS Pilani Hyderabad Campus
Free PHP chat script. No database required.