PuTTY - Popular free terminal application. Mostly used as an SSH client.
St - Free structural analysis software for PC and Mac
MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more
Alacritty - Alacritty is a blazing fast, GPU accelerated terminal emulator.
iTerm2 - A terminal emulator for macOS that does amazing things.
tmux - tmux is a terminal multiplexer: it enables a number of terminals (or windows), each running a...