This is an interactive one quadrant number plane
http://www.teacherled.com/resources/onequadgraph/onequadload.html

And this is an interactive four quadrant number plane
http://www.teacherled.com/resources/fourquadgraph/fourquadload.html

Move Billy Bug to the location given by the coordinates (in quadrant 1 only)

http://www.oswego.org/ocsd-web/games/BillyBug/bugcoord.html

A simple but effective tool for plotting points in the first quadrant.
http://www.yenka.com/freecontent/item.action?quick=nc#

Students use a TI-Nspire calculator to investigate coordinates of points and the gradients (slope) and equations of linear functions.
http://www.tialgebra.com/activities/algebra_i/335/

A flipchart that gives you access to an unlimited number of graphs, tables and yellow stickies.

http://www.oswego.org/ocsd-web/games/BillyBug2/bug2.html

Billy Bug now has to look for grub in all four quadrants.