Berzerk2002: I only know about the stuff that you can find on the website of the source port.
https://deponie.yamagi.org/quake2/texturepack/ Never used these myself so I can't tell how good they are.
_-Sorcerian-_: Oh, sorry for the late reply.
Thank you for your reply. I kept searching myself meanwhile and i found this post with upscaled textures compatible with Yamagi that look pretty ok IMO
https://www.reddit.com/r/GameUpscale/comments/e4fro3/quake_2_neural_upscale_quake_2_model_textures/fahng4n/
and as for models, i downloaded the ones in the page you posted. My thing with the models is that they're wobbly, and i was lookinf for non-wobbly models compatible with Yamagi. I know that Quake2XP uses them, but i found that source port a bit demanding for my potato :P
and for HQ, there is a neat texture pack on moddb made by russians that covers all 3 mission packs