LAN Messenger needed for inter company communication

I am looking for a free, secure, LAN only messenger (not over the internet), to communicate with users on Windows based computers.
What do you suggest?
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Jose Gabriel Ortega CastroCEOCommented:
Develop one :)
since all that I know uses the internet (Skype, Skype for business, WhatsApp, telegram).
Shaun VermaakTechnical SpecialistCommented:
Softros LAN Messenger. Has a 30day trial
NVITEnd-user supportCommented:
Why not use NET SEND?

Another, similar to LAN Messenger Shaun mentioned is:

Winsent Innocenti, a pared-down and simplified version of their paid version Winsent Messenger. Winsent Innocenti allows message receiving but does not allow users to send messages.

The paid version lets also users send: The site license price scale seems reasonable.
Mitul PrajapatiIT SupervisorCommented:
Check this link show, how to send message

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