IP Messenger:
1. communication between People who works on computer.
2. communicate one to one.
3. u can send text or other files by this tool.
4. based on .Net PlatForm with WPF UIElement.
OfficeSIP Softphone and Messenger are two enterprise VoIP SIP clients written in C# in .NET Framework. The SIP clients make use of Microsoft UCC API SDK, ensuring the highest quality of audio and video. Compatible with Office Communications Server.
See also open source, cross-platform:
1) simple messenger Brief Msg at http://briefmsg.org
2) MUVConf is a multi-user video conferencing, see demo video http://youtu.be/YrBU-Aqtvrk, download https://code.google.com/p/muvconf/downloads/list
LANCast IM will be a local area network(LAN) instant messaging software inspired by the AChat protocol. The project only at a planning stage, but things should move and coding should start this autumn