Git Flow - Git Flow is a very self-explanatory free software workflow for managing Git branches.
PuTTY - Popular free terminal application. Mostly used as an SSH client.
Working Copy - The powerful Git client for iOS
MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more
Git-Repo - Manage Gitlab, GitHub and Bitbucket from the command line
iTerm2 - A terminal emulator for macOS that does amazing things.