This was before koth, before payload, even before arena.
Almost before the internet, when computers were made from vacuum tubes and hay bales.
cp_labor is acutally pretty old.
And yeah, cp_arena_v6 was a daily staple.
crazed acre
Crazed arena
cp lazytown
ctf_mach4
ctf_mine4 (back when the intel still made you run slow)
Castle 2, then 3, then 4
Orange run v1, v2
orange zig zag
the skyscraper one (we still play sometimes, vertigo?)
rats_alpha (ug, like every day!)
casbah! Every day!

What was that other one, all 5 caps in a line? Heroic assault?
Horus (the egyptian one - but now it crashes?)
mount coaster
Snowbridge Thallus
Toyfort
warpath
wolf
cp zigzag - horrible little 1 cp map that was a super spam fest.
ctf dock
Convoy
Freezers
Respect
Turbine (pre-stock)
duel duel2 (and later 3)
Rock2, but only sometimes.
Scorpion as well.
There was one with a rocket inside a mountain. I thought it was called 'silo' or something, but could never find it again. Anyone know which one this was? You could go up to the top of the mountain and drop down through a hole in the ceiling onto the rocket (a newer map also has this feature, with slowly opening doors covering it).
Rocketball was more recent, but played incessantly.