Decaf is a free and open-source Wii U emulator for Windows and Linux. It is known to be the very first Wii U emulator ever released. It's in the early stages of development but can successfully boot several commercial games, albeit slowly with many glitches, and its last commit was on May 8, 2022.
Like Cemu, Decaf has high system requirements.
- OS: Windows or Linux, 64-bit
- GPU: OpenGL 4.5+ or Vulkan 220.127.116.11+
This emulator doesn't clean up allocations for textures and shaders, which can cause some issues (stuttering, crashes) after around a couple of hours. One possible solution is to periodically close the emulator.