The "PlayStation Portable Simulator Suitable for Playing Portably" is a multi-platform, open-source emulator written in C++ with the aim of speed and portability. It can run PSP games in full HD resolution with upscaling textures to reduce bluriness and most games are playable. Its development is ongoing and still in beta state, though does have a Switch port and libretro core.
Last Stable Release:
Windows: XP+ (recommended Windows 7+) & OpenGL 2.0+
Linux: Requires SDL2 installed
Mac: macOS 10.7+ (requires SDL2; install via Homebrew)
Android: 1 GHz+ & 2.3+ (requires Unknown Sources to be enabled)
JPCSP is an open-source PlayStation Portable emulator written in Java. It requires Java Runtime environment to be installed. it can reach 100% PSP speed on a lot of commercial games and is still being actively developed. That said, JAVA Runtime has a history of security breaches and tends to be a little slower than C-based emulators. All in all, it's a really intresting approach to emulation.
d18da8d8 / 01-09-2020
Geneal: Java Version 8
Windows: Vista+ (use 32bit even on 64bit OS to have sound and video support)
CPU: Dual core @ 2.5 GHz+
GPU: 2GB RAM+