PowerShell Plus - Learn how to learn and master PowerShell fast with an interactive learning center, a powerful IDE, pre-loaded scripts, and a PowerShell Editor… all for free.
PuTTY - Popular free terminal application. Mostly used as an SSH client.
PowerShell Studio - PowerShell Studio is the easiest GUI designer and script generator available.
MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more
GNU Bourne Again SHell - Bash is the shell, or command language interpreter, that will appear in the GNU operating system.
iTerm2 - A terminal emulator for macOS that does amazing things.