Thread:TitaniaGov/@comment-34873330-20180506081012/@comment-30208133-20180506104246

Algodoo is a 2D physics simulator that is loads of phun (pun intended) and downloadable for free on algodoo.com for Mac and Windows, and on the App Store for iPad for $4.99. The website also allows donation to fund the progress.

Phun is the earlier version of Algodoo. The name was changed since there were problems with copyright and there were a lot of other things called Phun. (That was why Emil made Phun )

From: Algodoo Wiki