RetroArch is a graphical frontend for emulators, game engines, and media players.
A front-end or user interface (UI) is the presentation and interaction layer of an app or website. Most modern emulator apps have basic game list UIs that you can interact with using a mouse/keyboard but not a game controller.
PCSP is a Sony PSP emulator written in written in c++.This app doesn't have any features at the moment.Discontinued
The project is no longer developed. Last version, 0.5.4, released in October 2011, can be still downloaded from the official website.