MyChat - Secure instant messenger for any network
BORGChat - BORGChat is a LAN messaging software program.
BeeBEEP - You can message and share files inside your intranet without a server.
Bopup IM Suite - Organize secure messaging system and communicate instantly via self-hosted IM server.
Output Messenger - Secure instant messenger app for office provides seamless instant messaging solutions for all office, corporate and enterprise business communication needs.
BigAnt Office LAN Messenger - BigAnt Office LAN Messenger offers rich features for secure and stable business communication.