Secure instant messaging system for team collaboration
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.
Softros LAN messenger - LAN messenger for an internal office chat for home or business users. It does not require a server and is very easy to install and use. It supports personal chats, group chats, message brodcasting, files transfer and remote desktop access.
WhatsApp - WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.
Bopup IM Suite - Organize secure messaging system and communicate instantly via self-hosted IM server.
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.