I have been improving a ported map from NFS U2 (Bayview) for the past few months, mostly adding lighting, seeing as U2 was a nighttime game. I have also made minor improvements (fixes) to the ported map from GTA 3 (Liberty City), and fixed the minimap/navigation for the GTA Vice City map port.
I'm not a map maker but I have been learning, and I prefer big urban maps so I have these along with a few others; bobs city/los injurus is another map by the dev who made the TN map, that just got updated a few days ago on the repo. I haven't made any changes to it myself since it's still in active development.
All these maps and more I rotate on my beammp server, too (and I've worked the last year to make it a fun place to be, limiting greifers and abilities that can be abused). If you want to poke at any of these on mp, I'm more than happy to jump on with any of these maps and more.