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grafeq

Grafeq is incredibly easy to use.  
Just type in the graph or graphs you would like, and it quickly generates it!
Download it here. http://www.peda.com/grafeq/

(click each image to see larger version)
Implicit graphing: 
input: 
x^yxy^2=sin(x)

Inequalities (you can choose the colors too!)
input:
y>=2x+3
y<3sin(x)
x<5y-2

Polar graphing
input:
r=2sin(1/2theta)+1  
NOTE: grafeq automatically inserts the theta symbol when you type "theta" (same for all greek letters)

Want to restrict the domain? NO PROBLEM (just press tab to add conditions)
input
r = 3sin(4theta)
PRESS TAB
0 < theta < pi