There are 3 repositories under quake2 topic.
An archive of John Carmack’s .plan files in readable markdown format
An attempt to bring Quake II movement physics to Unity engine.
Quake 2 textures upscaled using ESRGAN and the Manga109Attempt model
Quake 2 port for Apple Watch
An attempt at a homebrew port of id's Quake 2 for the PlayStation 2 Console.
🎮 BSP2OBJ is a command-line utility capable of converting Quake, Quake 2, Daikatana, Hexen 2, Kingpin and Half-Life map files into OBJ meshes
Heavily modified engine fork of Nvidia's Q2RTX. https://discord.gg/6Qc6wfmFMR
Structured List of Quake Engines
Converts Quake 2 map files to FBX format to import into modern 3D visualizing software
Public sub-projects from LP: Quake1/Quake2 ports for GCW Zero, Raspberry Pi and Creator CI20
NVIDIA’s implementation of RTX ray-tracing in Quake II
Quake modding toolkit for R. Can read, export and import Quake bitmap images in WAL and Q1 texture formats, read and export MDL and MD2 models, extract PAK and WAD archives.
Blender import/export .md2 and .mdx for Quake 2 and Kingpin
Zigock Bot for Quake II - Custom ZigFlag Capture and Hold
Steam Play compatibility tool that'll play a game with FTEQW.
Backport of the Quake 3 Arena Bot for Quake 2
Blender 2.8 Quake 2 mdl format import export
Daikatana restoration aiming to have a clean 1.2 source and to support modern systems
Quake 2 model renderer and animator in software