avaamo - Simple, Secure Business Messaging
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.
SupportKit - Embed Zendesk support into your iOS app with 1 line of code
MyChat - Secure instant messenger for any network
Fleep for Business - Simple, open collaboration and chat with admin capabilities
BORGChat - BORGChat is a LAN messaging software program.