Planarity is a multitouch adaption of the popular game Planarity, also known as Untangle. Each level starts with a tangled net of connected vertices. To solve a level, the player has to move the vertices around until no edge clashes are left, i.e. the net is untangled.
Written by Martin Heistermann, additional code by Thomas Schott & Ka-Ping Yee.
Planarity is Open Source and licensed under the GPL. You can get the source code using
git clone https://github.com/libavg/mtc-planarity.git
There is an Ubuntu package for Planarity.