aMSN - aMSN is a free open source MSN Messenger clone.
KouChat - KouChat is a simple serverless chat client for local area networks (wifi).
Wrike - Wrike is a flexible, scalable, and easy-to-use collaborative work management software that helps high-performance teams organize and accomplish their work. Try it now.
Softros LAN messenger - LAN messenger for an internal office chat for home or business users. It does not require a server and is very easy to install and use. It supports personal chats, group chats, message brodcasting, files transfer and remote desktop access.
4talk Messenger - 4talk is a free cloud messaging service for mobile devices and desktop computers
Secure Instant Messaging - Instant messaging over IP with encrypted data