Pidgin - Pidgin is an easy to use and free chat client used by millions. Connect to AIM, MSN, Yahoo, and more chat networks all at once.
Feem - Share files offline. No servers. No cloud. No limits.
Jitsi - Open-source video calling and chat platform.
LAN Messenger - LAN Messenger is a decentralized UDP IM-style chat client which supports usernames...
Skype - Stay in touch with your family and friends for free on Skype. Download Skype today to chat and call on desktop and mobile.
Winpopup LAN Messenger - Winpopup LAN Messenger is a cost-effective Office, Corporate, Enterprise Instant Messaging solution.