LvL curates and presents the best Q3 map releases, but all levels are interesting to me. To that end, here's a torrent of every Q3 level I've ever managed to find. It's 111Gb and consists of around 15.5k levels.
This is a magnet link you can paste into a torrent client to download it: magnet:?xt=urn:btih:0218cc054f95eab157621bdd54475addbf509138&xt=urn:btmh:1220c57bbda3b35342047b0a7c6a9478d8eca2873cb406bc5620a3e6aa10e050da1a&dn=Quake%203%20Level%20Archive&tr=udp%3a%2f%2ftracker.opentrackr.org%3a1337%2fannounce
It's probably missing many Defrag levels. Because there are so many and they're often low-effort I've not mustered up the patience to grab them all from Worldspawn.
Here is a list of all files in the torrent: controlc.com/abafc320
Here is a list of levels I know existed but haven't been able to find: controlc.com/5ddcf63f
If you have any levels on the missing list or otherwise not in the archive, please let me know!
Edit: September 2023 - Updated to a new magnet link. Some new content, mostly Urban Terror maps. Sorted a lot more into subfolders e.g. Defrag. Identified and removed some duplicates.
Edited 154 days after the original posting.
Its a small silly thing, but I remember it was either WCG 2002 or ESWC 2003/2004 that had a pk3 file that puts the
logo event on the maps used in the comp. Was a nice little touch back then.
To think, Q3 can reach 65GB just by maps alone. Not even counting all the demos from the comps backs then.