See it in action here!
A webGL program to graph functions of the form f(x,y,z)=0 in interactive 3D! Made for a presentation and hosted here because others might find it useful. Fancy equation rendering included.
To use, mouse over the bottom part of the page and type in a function involving the variables x, y, z, and time. You need to enter multiplications with a *, but they'll be hidden in the fancy LaTeX-ed output once you stop editing.
Code adapted from threejs.org's marching cubes example. It's unpolished and unoptimized, but it graphs things in 3D well. Simulation resolution will automatically drop until 30FPS or greater is maintained. Math rendering done with MathQuill.