SP Gears from here: Introducing a plugin of a new version of SPGear and SketchyPhysics from here: SketchyPhysics
Oh, they don’t track what version you’re using in real time? Huh. Well I put 16 and 21 since that’s the only ones I’ve used but was only fiddling with 21 trying to get the plugins installed but didn’t work and 16 was to get plugins work but it requires the license key to continue using as the trial didn’t activate…