
I remember a few of the Intellivision ports, the ones that came on cartridges that were basically Intellivision carts with a plastic adapter attached so they'd fit in a 2600. I remember Space Attack and Astrosmash in particular. A lot of the 2600 versions are on the Flashback Classics cartridge for Switch. I never saw an Intellivision in the wild though.
Speaking of controllers, I had an Atari 130XE. Since Atari's 8-bit computers used a lot of the same hardware as the 5200 it was super easy for Atari and amateur programmers to port 5200 games to the 8-bit computers. So you could play these games with conventional Atari and third party joysticks instead of the 5200 stick that didn't have a self-centering mechanism. People tend to crap all over the 5200, but seeing these games on the 130XE, many of them among the best arcade ports of the time along with early Lucasfilm Games classics like Rescure on Fractalus!, made me think that the 5200 could have been Atari's greatest system if it didn't have the crappy analog joystick and all the other weird design decisions.