PuTTY - Popular free terminal application. Mostly used as an SSH client.
iTerm2 - A terminal emulator for macOS that does amazing things.
MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more
JuiceSSH - The all in one terminal client for Android including SSH, Local Shell, Mosh and Telnet support.
Bitvise SSH Client - SSH client for file transfer, terminal and tunneling.
ZOC - Communication: SSH, Telnet, Rlogin, Modem, Serial Cable, ..