The freehand 3d tool looks a lot like "Teddy 3d" [0], a neat 3d drawing app that's based on some techniques presented at SIGGRAPH in 1999 [1].

This is a really interesting technique and could have a lot of fun uses.

[0] http://www-ui.is.s.u-tokyo.ac.jp/~takeo/teddy/teddy.htm [1] http://www-ui.is.s.u-tokyo.ac.jp/~takeo/papers/siggraph99.pd...