Here's a few that come to mind:
Update - Forgot that Estes once had a program in the late 1970's and early 80's for selected builders to assemble kits for Estes, to be used by hobby shops or others who needed a built rocket. I did that a few times. Including IIRC 24, possibly 36, Maxi-Alpha 3's and some kits I never built for myself. So, that is a technicality since the spirit of this should be kits built for one's own reasons, not "for hire" (payment was Estes Merchandise certificates).
MPC Pioneer-1 (lost first one). MPC MoonGo (first one burned up on the pad). Probably some other duplicated MPC kits from my early days.
Estes Interceptor (second one was in a model display case in my High School Air Force JR ROTC classroom.... someone stole it).
1/45 Little Joe-II (Centuri's in 1975, very badly beaten-up but still have it in storage. Estes overhauled re-release in 2016).
I had a lot of Centuri kits (1/100 Little Joe was my first non-MPC kit , 5th overall, once I got into the hobby for real) but other than the 1/45 kit can't think of an example right now of any that I built more than one of.
update to above - Centuri 1/35 Mercury Redstone, at least twice.
Estes Goblin
Estes SkyDart glider (at least two kits, not including the 2X RC scale-up)
MPC Flat Cat glider
MPC Delta Katt glider (Not including a 2.5 or 3X scale-up)
Estes Falcon glider (two, plus 2.5X scale-up)
Estes Astron Space Plane* - (* never built the actual kit. In 2008 built 2X and also a 4X Scale-up R/C models. 2X was an R/C test prototype for the 4X)
Noticing a theme here about gliders?
Also as I got better at designing my own gliders, I did less and less glider kits. Indeed my first Falcon never worked (dived on flight 1, shredded flight 2), and the second Falcon was built in 2016 along with the 2.5X scale-up for R/C)
Several Vector Aero Stingray R/C Rocket Gliders from 1996 to 2000 or so (Composite wing models that I did not have the equipment/skills at the time to make my own wings. Now I do).