Nets of 3D objects
https://sg.ixl.com/math/secondary-1/nets-of-three-dimensional-figures
http://illuminations.nctm.org/
http://www.khake.com/page47.html
https://www.khanacademy.org/math/geometry
http://www.educatorstechnology.com/
http://www.educatorstechnology.com/2012/02/free-math-resources-lesson-plans-games.html
Applets for Mathematics
http://edinformatics.com/il/il_math.htm
http://www.nctm.org/standards/content.aspx?id=25037
http://www.geogebra.org/cms/en/info
http://www.geogebra.org/en/upload/files/lookang/PropertiesofTrianglewee.html
http://ocw.nd.edu/mathematics/elements-of-calculus-i/calculus-applets-website/calculus-applets
http://archives.math.utk.edu/cgi-bin/math_archives/interactive.html
http://pages.infinit.net/pagedage/appletsjava.htm
http://www.visualfractions.com/investigate.htm
http://math.ucsb.edu/oml/34A.html
http://www.mathplayground.com/measuringangles.html