Save these files into your Quake III Arena/baseq3 directory,
then restart or start Quake III Arena.

These two are from one of my buddies in the VK clan. I don't know where from originally but props to the makers, they are cool.

The Edge, remake of q2dm1. For some reason, the map below you'll have to right click on, click save as and save it in your base q3 directory. It might still save the pak file as q3edge.pk3.zip, in which case just rename the file to q3edge.pk3, and restart quake3.

CTF Maps

Teamplay maps