Take back control of your email with this mail server in a box
Wireless-LAN for Hotels ,Cafés and Shools
Chat Messenger. E-Mail-Client. Websearch. Filetransfer.
Anti Spam SMTP Gateway
Zentyal is a Linux Small Business Server
An easy-to-use anti-spam email gateway
PeerGuardian - a privacy oriented firewall application
Lomalarga is a VPN-like service based on SSH and Linux.