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CECSA (Chess Engine Compiler Script for Android):
A short description already exists here: https://sourceforge.net/p/chess-engines-for-android/wiki/home/.

CETSA (Chess Engine Tournament Script for Android):
With CETSA you can play tournaments under Termux using the command line tool c-chess-cli. However, the preparation of a tournament takes place outside of Termux, so you can use the tools (apps) you are familiar with on Android. The only thing you have to do in Termux is start the tournament.

Example:
How to play a tournament with CETSA