bsnes-hd (formally "HD Mode 7 mod, for bsnes") is a fork of bsnes that adds HD video features, such as:
HD Mode 7
Rendering the rotated, scaled or pseudo perspective backgrounds at higher resolutions. This does not involve new custom imagery or upscaling algorithms. It is a higher resolution version of the process the SNES uses.
Mostly for Mode 7 scenes, but also works for some other scenes/games here and there. Some setting tweaking required...