Mathematics Freeware?

bomba923

Do you guys know any free plotters?
(or the sites/links to them)
Any free program/software that can plot sequences?

Such as
A_n = sum(mod(floor(n/p^k),p)*(p/q)^k,k,0,n)
A_n = sum(seq(mod(floor(n/p^k),p)*(p/q)^k,k,0,n))

Which is
[tex]A_n = \sum\limits_{k = 0}^n {\bmod \left( {\left\lfloor {\frac{n}{{p^k }}} \right\rfloor ,p} \right)\left( {\frac{p}{q}} \right)^k }[/tex]

neurocomp2003

www.opengl.org, www.libSDL.org

bomba923

Thanks for the links, I'll check them out today