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Kyty

Check here to access GitHub

Check here for downloaded early stage emulator

Kyty is a PS4 & PS5 emulator in the very early stage, but looks quite promising. While the graphics for PS5 are not yet implemented, it's possible to run some simple PS4 games, but don't be surprised if they also have graphical glitches, crashes, freezes and low FPS. All in all, it's still being actively...

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Spine

Check here to access GitHub

Spine's Wine-like PS4 emulator for Linux ONLY is capable of playing some basic commercial games, albert with usual early in development limited performance and accuracy. That said, Flatpak instructions is available on Github or you can download latest release from here (dated 01/09/2021)

It's still very actively developed and seems promising.

PS4Delta

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. 

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GPCS4

Check here to access GitHub

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.

Check roadmap here

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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.

Check roadmap here

Relevant Files

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fpPS4

Check here to access GitHub

fpPS4 is a PS4 emulator for Windows and more specifically a “PS4 compatibility layer over Free Pascal”. According to the developer, this project is made for fun and is still in its infancy.

It's already capable of running some commercial games such as Sonic Mania as these particular type of games are often used for early testing. It's due to them using less advanced function calls and possibly less 3D which makes them easier to be a starting point.