WhatsApp

Internal private chat application
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Looking for Internal private messaging Software for Business check Output Messenger it’s best internal team collaboration Application Similar to Slack and winpopup. features are internal file sharing, internal mailing, group chat room, audio chat, video group chat conference desktop sharing etc..,

Srimax
ASP.Net

http://www.outputmessenger.com/lan-messenger-downloads/
Srimax Software System PVT LTD
Commercial
http://www.outputmessenger.com/wp-content/themes/outputmessenger/images/outputmessenger-one-to-one-chatwindow.png