Chess Engines OEX is a collection of open source chess engines compiled by Bernhard C. März and developed by Karl Schreiner. This Android app contains a range of chess engines using the Open Exchange protocol, including Rodent IV 0.32, OpenTal 1.1, Toga II 4.01, Gambit Fruit 2.2 beta 4bx, Laser 1.8 beta, and Andscacs 0.921.

To use any of these engines, you will need a chess application that is compatible with the Open Exchange protocol. The collection is released under the GNU General Public License v3 and the source code is available on GitHub. Whether you are a chess enthusiast or a developer looking to incorporate open source chess engines into your application, Chess Engines OEX is a valuable resource.