I don't have a personal platform for this, but am uploading missing content to existing ones I know of: lvlworld.com - Curated, the polished and more playable

I don't have a personal platform for this, but am uploading missing content to existing ones I know of: lvlworld.com - Curated, the polished and more playable end of the spectrum en.ws.q3df.org (Worldspawn Archive) - Mostly focused on defrag (trick jumping) maps but has a lot for the standard game mixed in. Excessive Plus's FTP server at ftp.excessiveplus.net efservers.com/maps.php Elite Force Map Search. Has a lot of regular Q3 content buried amongst the Elite Force stuff.