Termux – An Android terminal emulator and Linux environment on your phone

Sadly, no longer being uploaded to the Play Store due to Google's unreasonable policies: https://wiki.termux.com/wiki/Termux_Google_Play

I've been using Termux for ages. It's an extremely handy tool for engineers and technicians that need a simple terminal emulator on the go with access to common tools. Deffo saved my bacon a few times.