Unofficial messaging app
This bulk SMS software for sending messages to whole list of contacts through PC.
Bulk SMS Caster Enterprise helps to send bulk SMS from PC or Laptop to Mobiles.
Discover invisible Yahoo! Messenger users and keep track of their online time
A free app for Windows, by Meng Tan
Exchange encrypted instant messages and files over office LAN, business networks
Server-side software that organizes, manages and controls all of your private IM system.
Hold virtual meetings easily
bClient is the program for sending SMS and Email messages.
Cross-network IM client with support for Facebook