For 2D and 3D shape activities go to:
http://www.coolmath-games.com/0-seesawlogic/index.html
http://www.ngfl-cymru.org.uk/vtc/ngfl/maths/maerdy_2d/rnd_frames.asp
http://www.bbc.co.uk/bitesize/ks1/maths/shapes/play/popup.shtml
http://www.crickweb.co.uk/ks2numeracy-shape-and-weight.html#
http://www.primaryresources.co.uk/online/longshape3d.html
http://www.math-play.com/basic-shapes-game.html
http://www.mathcats.com/explore/polygons.html
http://www.math-play.com/3d-shapes.html
http://www.coolmath-games.com/0-findthepair/index.html
http://illuminations.nctm.org/ActivityDetail.aspx?ID=27
http://www.math-play.com/geometric-figures-game/geometric-figures-game.html
http://www.purposegames.com/game/2d-shapes-quiz
http://www.math-play.com/polygon-or-not/polygon-or-not.html
http://www.sadlier-oxford.com/math/enrichment/gr4/EN0411b/EN0411b.htm
http://www.ngfl-cymru.org.uk/gp/pupils/maths/2Dshapes.htm
http://www.bbc.co.uk/schools/starship/maths/games/calamitys_quest/small_sound/standard.shtml
For symmetry activities go to:
http://www.innovationslearning.co.uk/subjects/maths/activities/year3/symmetry/shape_game.asp
http://www.innovationslearning.co.uk/subjects/maths/information/shape_facts/shape_facts.htm
http://www.haelmedia.com/OnlineActivities_txh/mc_txh4_001.html
http://www.softschools.com/math/geometry/symmetry_game/
http://pbskids.org/cyberchase/math-games/symmetrizer/