EmuNations

PS4Delta

Check here to access GitHub

PS4Delta is a very high level PlayStation 4 emulator, written in c++. It's quite early in the development stage and barely manages to initialize all firmware modules though is actively being worked on. 

GPCS4

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1 commercial game running, though not playable with very low FPS since there's no optimizations at all currently. GPCS4 recompiles all shaders, untiling all textures and upload all buffers every frame, making it quite inefficient.

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Check roadmap here

Orbital

Check here to access GitHub

The current state of Orbital at booting decrypted kernels: both PS4 4.55 and PS4 5.00 have been tested.

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Check roadmap here

Spine

Check here to access GitHub

The current state of the Wine-like emulator for Linux is unknown since it's closed-sourced. That said, the only available artifact is a demo version which is a Flatpak package. Don't expect much from this demo as it is a proof-of-concept.