Commandline Challenge - Test your command line skills
PuTTY - Popular free terminal application. Mostly used as an SSH client.
Prompt - Prompt provides fully-integrated writing education solutions, combining instruction, curriculum, and feedback. We support educational institutions, companies, and individuals.
MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more
Cwiki - A Command line interface for searching Wikipedia!
iTerm2 - A terminal emulator for macOS that does amazing things.