[wetbaby]

Easy setup:

1) Download and unpack ironwail (best engine).

2) Copy id1/ (from your official Quake install directory) to your ironwail directory

3) Launch ironwail

Adding and launching a mod:

1) Unpack the mod into your ironwail directory

2) Launch ironwail

3) select the add-on

If you have quake on steam, ironwail will automatically detect it.

If you want to directly launch into a mod you can create a shortcut or use command-line parameters.

[barbariangrunge]

There's something called quake injector too, which makes it even easier to get access to maps, at least ones on quakespasm. You probably still need to add them manually if they're from slipseer, but i think most are on both sites

[wetbaby]

Ironwail can download some popular add-ons in game. Not as robust as injector, but is extremely accessible.