LAN Messenger - LAN Messenger is a decentralized UDP IM-style chat client which supports usernames...
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
BORGChat - BORGChat is a LAN messaging software program.
Slack - A messaging app for teams who see through the Earth!
Feem - Share files offline. No servers. No cloud. No limits.
Skype - Stay in touch with your family and friends for free on Skype. Download Skype today to chat and call on desktop and mobile.