This October we decided not to make a game, but to wrap up some of the scripts we use for Unity and release them on the Unity Asset Store. We managed to sell for more than 1$ so I guess I’m sort of participating!
This is not advertisement. Don’t buy them if you don’t need them, this is just to show what I spend my October challenge on.
2D IK Solver:
This package implements a fast and precise solution for the two-bone inverse kinematic problem in 2D.
Take a look at webplayer demo to get an idea. (source included in the package).
This utility allows you to lock GameObjects in the scene so that they will not be moved by accident.