Production:
Spyderco:
Southard
Domino
Dice
ZT:
056x series
0801
0350
0200
030x
0770
0777
0888
Kershaw:
Leek
Scallion
Skyline
Cryo I and II
Thermite
Scrambler
Manifold
just to name a few
CRKT has knives with flippers, I'm just not a fan of the brand so I don't know the names of their offerings.
Brous (semi-production)
Bionic
T4
Division and mini-division
Silent Soldier flipper
Hinderer
Kizer
If you go custom, I like Brian Tighe's flippers a lot. I'm not that well versed in custom's with flippers so others can help you out there.
I have:
ZT0801--Amazingly smooth
Brian Tighe mini Tighe Rod--very nice
Brous Bionic (strong detent, pointy flipper, but if you have tough fingers its awesome.
Kizer 3404-- very nice as well for not being on bearings like the other three.
I've owned or at least played with:
Spyderco Southard: Not impressed with the shape of the flipper and the action.
Kershaw Leek--not really an a/o fan.
Kershaw Scallion-see above
ZT0350-Not a fan of a/o, deassisted it was ok, just not an overbuilt folder fan.
Just a small list to go by. Good luck.