PPSSPP is an open source project, licensed under the GPL 2.0 (or later). Anyone is welcome to contribute improvements to the code. Partly thanks to such contributions, PPSSPP's compatibility is steadily increasing, letting us all play our PSP games on the devices of our choice.
PPSSPP v1.5.4 Changelog:
For Windows, Linux, Android, iOS, and macOS
http://www.ppsspp.org/index.html
PPSSPP v1.5.4 Changelog:
* v1.5.4
* Try to fix iOS builds on the Travis buildbot. #10254
* Replacement: Break the mip loading loop if a level is wrong. Also shrink the log output.
For Windows, Linux, Android, iOS, and macOS
http://www.ppsspp.org/index.html