You can try OpenJDK project:
https://www.youtube.com/watch?v=2AcTHXhd1Ms https://github.com/shinyquagsire23/OpenJKDF2 Download here:
https://github.com/shinyquagsire23/OpenJKDF2/releases (↓ Scroll to the bottom for ZIP download links. ↓)
Look under Assets. Normally they I hidden, so you need to click so it shows the packaged zip files for Windows, Mac etc.
Install instructions:
Running Windows: Extract the distribution zip so that openjkdf2-64.exe is in the same directory as JK.EXE, then run openjkdf2-64.exe.
MacOS: Copy OpenJKDF2.app into your Applications folder and run it. You may need to right click -> Open to get around Gatekeeper.
Linux: Install via
Flathub, or compile and copy openjkdf2 into the same directory as JK.EXE and run.
If game assets are missing, an install prompt will show on startup and ask for either: An existing GOG/Steam/original installation
An original Disk 1, followed by Disk 2
To transfer saves, enter the main menu and select Expansions & Mods, then click Open Resource Folder. A window will open where you can copy your old player folder to. You can also install any mods to mods/ and episodes/.
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Oh and on interesting information for everybody, who loves this game.
Here is a German guy, who tries to remake the whole game in modern Unreal Engine:
https://www.youtube.com/watch?v=lfHzFlifiOE