Interactive
Here is a collection of interactive learning Java Applets.
Geometry
Platonic Solids (F.1) Transformation of a Triangle (F.1) Angle Sum of Triangle (F.1) Circles of a Triangle (F.1) Pythagoras Theorem (F.2) Sum of Exterior Angles (F.2) 3D Line (F.7)
Game
Four Liters of Water