For Quake 1 its Darkplaces[1] or Quakespasm[2] (the former emphasizes more features, but has been dead for some years, the later is meant to be a more honest upgrade).
There are HD texture packs like Quake HD[3] and Epsilon[4] on moddb that work with either. All HD modpacks for both games are just like any mappack.
For Quake 2 I use Yamagi[5], but there is also KMQuake2[6] which is like Darkplaces from Quake 1. For HRT packs the only one I know of / have used is Berserker[7].
I think all those moddb packages are prebundled with Windows executables. You can just take the data directories and use them with your engine of choice.
There are HD texture packs like Quake HD[3] and Epsilon[4] on moddb that work with either. All HD modpacks for both games are just like any mappack.
For Quake 2 I use Yamagi[5], but there is also KMQuake2[6] which is like Darkplaces from Quake 1. For HRT packs the only one I know of / have used is Berserker[7].
I think all those moddb packages are prebundled with Windows executables. You can just take the data directories and use them with your engine of choice.
[1]https://icculus.org/twilight/darkplaces/
[2]http://quakespasm.sourceforge.net/
[3]http://www.moddb.com/mods/quake-hd-pack-guide
[4]http://www.moddb.com/mods/quake-epsilon-build
[5]http://www.yamagi.org/quake2/
[6]http://www.markshan.com/knightmare/
[7]http://www.moddb.com/mods/berserkerquake2