PuTTY - Popular free terminal application. Mostly used as an SSH client.
LAN Messenger - LAN Messenger is a decentralized UDP IM-style chat client which supports usernames...
MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more
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.
iTerm2 - A terminal emulator for macOS that does amazing things.
Bopup IM Suite - Organize secure messaging system and communicate instantly via self-hosted IM server.