https://powdertoy.co.uk/Search.html?Search_Query=powder+game+skylark
https://powdertoy.co.uk/Discussions/Thread/View.html?Thread=11833
Skylark created Powder Toy initially due to having difficulties with running Powder Game in java while running linux. Yeah. And then stuff happened. Simon picked up the game after about a year and some months of idle time of no development, and now we're here.
Completely different code, but Powder Toy does take some inspiration from powder game and all the other falling sand games out there.
but it was SkyLark who first coded TPT 1.0, right?