OpenGOO is described as 'A free and open clone of World Of Goo. Dedicated to Aurélie. It utilises qt and opengl for graphic and objects interaction and Box2d for the physics'. There are five games similar to OpenGOO for a variety of platforms, including Windows, Android, Android Tablet, iPad and iPhone. The best alternative is World of Goo. It's not free, so if you're looking for a free alternative, you could try Tower of Goo or Trash Tower. Other OpenGOO like games are Eufloria (Paid) and Prune (Paid).