Scoop - A command-line installer for Windows
PuTTY - Popular free terminal application. Mostly used as an SSH client.
Windows Remix - Web-based batch software installer with zero dependencies. Recommended first visit after reinstalling Windows or buying a new laptop.
MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more
App Grid - App Grid is an alternative to the Ubuntu Software Center.
iTerm2 - A terminal emulator for macOS that does amazing things.