DroidFish is an Android port of the very strong Stockfish chess engine, combined with a feature-rich graphical user interface.

Features:
- Opening books: Internal, polyglot, CTG, ABK
- Clocks
- Analyze mode
- Two player mode
- Edit board
- PGN import/export/edit
- FEN/EPD import
- Adjustable playing strength
- One Touch Moves
- Blindfold mode
- Color themes
- Animated moves
- Scid DB support using "Scid on the go"
- Highly configurable
- Third party UCI engines
- Configurable UCI engine options
- Support for "open exchange" engine apps, such as texel and komodo 8.
- Gaviota endgame tablebases
- Syzygy endgame tablebases
- Free, GPLv3

Source code is available from my web page.

The following permissions are used:

Modify/delete SD card contents
To save games to SD card

Full internet access
To optionally communicate with network chess engines

Control vibrator
To optionally vibrate after computer makes a move