PCSP is described as 'Sony PSP emulator written in written in c++' and is a Game Emulator in the Gaming Software category. There are four alternatives to PCSP for a variety of platforms, including Linux, Mac, Windows, Android and Blackberry. The best alternative is RetroArch, which is both free and Open Source. Other great apps like PCSP are PPSSPP (Free, Open Source), Nostlan (Free, Open Source) and Jpcsp (Free, Open Source).
What is RetroArch? RetroArch is a modular multi-system emulator system that is designed to be fast, lightweight, and portable. It has features lacking in some emulators frontends, such as real-time rewinding and game-aware shading. What systems does it play?
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.