Newgrounds is dead serious about preserving its content, even with the death of Flash. Ruffle, the Flash emulator, was created by a former employee and Newgrounds is a major sponsor of the project. The most important movies have been converted to video as well.

When Newgrounds adopted high-resolution thumbnails about a decade and a half ago, there was a big volunteer campaign to recreate thumbnails for the entire back catalogue of the portal.

Thanks to Ruffle, people can and are still submitting Flash content to the portal, in addition to web-friendly content!

The repo has source code and a brief writeup, including run instructions. It’s an x86 port from Atari Basic. Actually, since this video, a contributor cut it down to 483 bytes!