Im new to engine swapping in cars but have done a few for bikes, I'm interested in getting started on rotary engines, and easiest to find is of course from the rx7, rather then asking what OTHER engines I can put IN an rx7, I'm asking what other cars can I put the engine into easily

 

Least amount of work is probably going to be any other factory RWD car. 240sx, AE86 Corolla, etc. Other than the "different" factor though, I don't know why you would go through the hassle.

 

Adapters are available that will allow you to bolt a rotary engine to a VW transmission. Given the large number of VW-based kit cars and home-built cars, this may be your best bet if you like building things yourself.
https://www.kennedyeng.com/4-cylinder-engine-list
https://en.wikipedia.org/wiki/Locost

 

There's a guy near me that built a rotary powered bug eyed sprite