Teaching Mathematical Thinking Through Origami - http://rachel.ns.purchase.edu/~Jeanine/origami/ Suggestions for using origami to teach concepts in mathematics, with diagrams of models.
Origami Mathematics - http://www.merrimack.edu/~thull/OrigamiMath.html Mathematics of paper folding; includes a bibliography of articles and journals, Combinatorial geometry syllabus, and a tutorial on geometric constructions. Photo gallery of completed modular, geometric, and tessellation models.
Tom's Origami Gallery - http://www.merrimack.edu/~thull/gallery/modgallery.html Personal gallery of modular and tessellation models.
Geometry Junkyard: Origami - http://www.ics.uci.edu/~eppstein/junkyard/origami.html Resource listing of links for information about the relationship between origami and geometry.
nuwen.net - Origami Polyhedra - http://nuwen.net/poly.html Illustrated directions for making four types of polyhedra.
Mathematical Origami - http://www.mat.unb.br/~lucero/orig_e.html Origami models and techniques with strong mathematical precepts.
Helena's Origami - http://www.math.lsu.edu/~verrill/origami/ Modular origami and tessellations by Dr. Helena A. Verrill. Instructions included.
Jim Plank's Origami: Modular - http://www.cs.utk.edu/~plank/plank/pics/origami/origami.html Diagrams and gallery of many geometric models.
Modular Origami - http://www.geocities.com/golics/index_en_sum.htm Instructions, diagrams and pictures of various modular models in English, German, and Russian.
Modular Origami - http://hektor.umcs.lublin.pl/~mikosmul/origami/ Images of modular origami models folded by MichaĆ Kosmulski. Model categories include: fractals and IFS, interesting mathematical objects, polyhedra and balls, spiked balls and stars.
Origami Tessellations - http://www.origamitessellations.com Weblog by Eric Gjerde featuring tessellations, crease patterns, tessellation geometry, origami mathematics and paper folding in general.
Krystyna Burczyk's Origami - http://www1.zetosa.com.pl/~burczyk/origami/galery1-en.htm Photos of regular polyhedra models.
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