One folding style with several printable designs (some takes lots of ink). Creator also offers OpenOffice.org Draw templates (Creative-Commons license) to create your own Letterfu design.
The spatial applications and the supporting information that is being made available through Internet map applications represent a unique set of examples of the democratization possible through Internet applications
F. Klompmaker, V. Paelke, и H. Fischer. Distributed, Ambient, and Pervasive Interactions: Proc.\ of the First International Conference (DAPI 2013), Las Vegas, NV, USA, 8028, Springer, Heidelberg, (2013)