[Android] & [iOS] Free "Knots 3D" $0, Riptide GP2 $0 @ Google Play (Was $2.49)

Free again for those who missed out last time.

Choose from 87 different knots and see how they're tied in incredible detail. Watch the knot draw itself or use your finger to tie and untie the knot. Its easy to see where the virtual rope goes in and out and around. (Something about a rabbit and a hole and a tree right? ) Zoom in on the knot to get a closer look or flip it around for another perspective. Can your old school knot app do that?!

iOS

Riptide GP2

Riptide GP®2 kicks everything into overdrive, with intense online multi-player races, upgradeable hydro jets and riders, improved graphics, an all-new career mode, and a whole new stunt system with dozens of new tricks!
Featuring rocket-powered hydro jets racing around futuristic tracks across a dynamic and interactive water surface, Riptide GP2 delivers a fast, fun, and visually stunning racing experience.
From Vector Unit, developers of acclaimed racing games Riptide GP, Beach Buggy Blitz, Shine Runner, and Hydro Thunder Hurricane!