ssh server

IceChat Multi-Server, Scriptable, and fully customizable IRC Client

Use IMAP to pull mailbox messages and folders from other IMAP server.

A PHP Tester and Debugger which is also an extremely lightweight PHP Web Server.

httpdASM is a web server (httpd), written in ASM, running on Windows.

Open source AJAX webmail script for existing POP3/IMAP/SMTP server or cPanel

Powerful web server log analyzer

Squiggle is a free lan messenger that does not require a server.

Turn your unused computer into an easy to use music server/jukebox.

Create you own Instant Messenger at office - server PHP/MySQL.

Comm100 Forum Open Source is based on ASP.NET and SQL server.