PINO is a full featured open source client/server chat system for Windows.
EditByBSEditor: PINO is a full featured open source client/server chat system for Windows. It offers everything required from a Modern chatsystem today in an intuitive and user friendly GUI. Below is a small overview about its basic features.

20 versatile commmands
Unlimited number of system rooms
User rooms for private conversations
Support for guest users
Password protected user Profiles
Participation in multiple conversations
4 user groups with different rights
Kick or ban disturbing users
Display your own clickable images (for advertisements or information)
Direct connections for fast file transfers
IP based security features
Process the current userlist with external applications (eg PHP) you can free download PINO 3-Server Build 263 now.