I’ve written a chess engine for Android and would be delighted if there were any chess players here who would be willing to test it and give me some feedback. Although the engine isn’t as strong as Stockfish, it does have the unique feature of having 3-4-5-piece endgames (WDL only) built in. In addition, unlike the other Android engines, it also has a terminal mode so that it can be used for testing even without a chess GUI. The only requirement for participating is that you have an Android device (smartphone or tablet) and a Gmail address to which I can send the link to the engine. If you’re interested, please feel free to send me a message here on Lichess.
Axel