I know this yesmap wiki article: https://wiki.yesmap.net/wiki/MAP_Flag I don’t know much else about it though

It sadly doesn’t have exporting, so users screen record instead. And, even though people say it’s fine copyright-wise and post their creations on YouTube with no problem, there’s also the official paid version called Vyond. And there’s another unofficial web-based site called Flashthemes that allows exporting.