PuTTY - Popular free terminal application. Mostly used as an SSH client.
Amazon Appstore - The Amazon Appstore is a place to purchase and download apps for your Android device.
MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more
Aptoide - Aptoide is a third party replacement for the traditional Google Play Store.
iTerm2 - A terminal emulator for macOS that does amazing things.
F-Droid - F-Droid is an interesting alternative for Android users who want to try something different and not have to use the Goole Play store all the time.