Quake Injector in FTEQW
From Quake Wiki
The Quake Injector plugin downloads mods and metadata from Quaddicted. The mods are downloaded and run from cached zips within the downloads directory, rather than having their own individual game directories.
Most entries are maps, but many will have dependencies. Note that few mods have directly been tested with FTE, but a number of those that have do require /sv_nqplayerphysics to be set to 1 (alternatively enabled via the ‘compatibility’ game config).