AquaTalk is Free program for Mac OS developed by Simon Looschen
AquaTalk is a server and client colloquy system duo. The server allows you to kick users off, view user history, guard colloquy viable, view number of connections, ban users, view transfer information in bytes, regard the direct traffic, confer temporary admin permissions to users, scatter administrative messages to users, agape rooms, and set flood-protection settings. The client utilization allows you to customize your colloquy window and transfer files to other users.
Microsoft Messenger for Mac is Freeware program for Mac OS developed by for-Mac.com
By using Microsoft Messenger for Mac, you can note when your friends, relatives, coworkers, and associates at other companies are online and then transmit with them instantly. Run on both PowerPC-based and Intel-based Macs. - Absolutely Free