[2012/6/17] Source code of ORIPA was released as an Open Source. [2011/9/6] All contents about ORIPA was moved to this page. ORIPA is a drawing software dedicated to designing the crease patterns of origami. The unique feature of ORIPA is calculation of the folded shape from the pattern. The first version of ORIPA was released in 2005. ORIPA は折紙の展開図を描くための専用ドローソフトです。平坦に折りたたむことができる展開図に対しては、それを折りたたんだ