Vitor Vilela, a Brazilian Super Nintendo hacker also known for his FastROM projects that speed up classic Super Nintendo titles, has officially released a widescreen hack for the landmark Super Nintendo title Super Mario World. This hack renders the entire game as it should look normally, but expanded to fit the widescreen resolution that's standard today. Currently, it only supports 16:9 and 16:10 monitor resolutions, but more additions are planned, such as support for 2:1 or the 21:9 ultrawide aspect ratios. As of right now, a patched ROM will only be compatible with the bsnes-hd emulator.
Twitter user @fraencko shared some images of the game running on a widescreen monitor that can be seen below.