LAN Messenger - LAN Messenger is a decentralized UDP IM-style chat client which supports usernames...
MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming
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.
GNU Octave - GNU Octave is a programming language for scientific computing.
MyChat - Secure instant messenger for any network
Wolfram Mathematica - Mathematica has characterized the cutting edge in specialized processing—and gave the chief calculation environment to a large number of pioneers, instructors, understudies, and others around the globe.