A user going by the name “DerKoun” has submitted a post on the /r/emulation subreddit about a mod to popular cycle-accurate Super Nintendo emulator - BSNES - which makes it possible to increase the resolution of Mode 7 graphics by 4X. essentially turning classic SNES games into HD.
Mode 7 is the Super Nintendo’s built-in hardware-accelerated mathematical functions which allows for efficient rotation and scaling of sprites on the screen.
Here is a before & after example of Mario Kart:
A few further comparisons can be found here.
Unfortunately, this mod is currently only available for the Windows branch of BSNES, but it’s likely we will see port to macOS, Linux and other systems in short order.