Right-click and "save target as".  Place maps in your baseq3 folder.  Do the maps below download as a .zip?  Its a bugger init.  If they do, when you save it, add ".pk3" to the filename and change "save as type" to "all files", not "winzip file".

q3dm3remix

((includes q3dm9remixrail)  
q3dm9remix

17instamix
17insta (or 17rail if you prefer 125 health to start)

q3dm13remix

17t6ctf

tourney3remix

15+1remix

electricram

wtf2remix

sixchuter

nquit5

doom_rail

Lots of maps link1

Lots of maps link2

Lots of maps link3

Over 1000 other tricks maps here