Internet and Software Resources
I cannot do it without comp[u]ters.
—William Shakespeare (1564–1616)

• Cabri-geometry.http://www-cabri.imag.fr/cabri2/accueil-e.php
• CPMP-Tools free general use mathematics software for Core-Plus Mathematics. http://www.wmich.edu/cpmp/CPMP-Tools/
• GeoGebra is a free and multi-platform dynamic mathematics software for schools that joins geometry, algebra and calculus. http://www.geogebra.org/cms/
• Geometer is a free dynamic geometry program developed by Tom Davis. http://www.geometer.org/geometer/index.html
• Geometer's Sketchpad by Key Curriculum Press.http://www.keypress.com/sketchpad/
• Geometry Expressions http://www.geometryexpressions.com/
• Geometry Playground A wiki page with a java program for constructions in Euclidean and Non-Euclidean geometries
   https://students.washington.edu/josher/mediawiki/index.php?title=Main_Page
• NonEuclid java program for constructions in hyperbolic geometry. http://cs.unm.edu/~joel/NonEuclid/NonEuclid.html
• Peanut Software includes a dynamic geometry program called Wingeom – a free dynamic geometry software program for constructions in Euclidean, hyperbolic, and spherical geometry.http://math.exeter.edu/rparris
• Quick Math online CAS program using Mathematica http://www.quickmath.com/
• Spherical Easel a dynamic geometry exploration of the Riemann Sphere. http://merganser.math.gvsu.edu/easel/ a java exploration of the Riemann Sphere model.
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• Euclid The Thirteen Books of The Elements, Sir Thomas L. Heath's Transaltion, http://www.perseus.tufts.edu/cgi-bin/ptext?lookup=Euc.+1
• Joyce, David E, Java Edition of Euclid's Elements, 1997. http://aleph0.clarku.edu/~djoyce/java/elements/elements.html  
• Whistler Ally Mathematics Geometer's Sketchpad script and tools http://whistleralley.com/math.htm