Feem - Share files offline. No servers. No cloud. No limits.
Dialog Messenger - handy and feature-rich enterprise multi-device messenger available for server or cloud – Slack-like, but not Slack-limited
LAN Messenger - LAN Messenger is a decentralized UDP IM-style chat client which supports usernames...
Ripcord - A desktop chat client for Discord and Slack
Winpopup LAN Messenger - Winpopup LAN Messenger is a cost-effective Office, Corporate, Enterprise Instant Messaging solution.
Ziggs - Smoothly Share Content Between Devices!