Lots of discussion in this Slashdot post about renderers for SVG. I don't know which of them using OpenGL, if any.
This SO question also has several suggestions, including sauvage which is done in Python. Cairo is also apparently a possibility.
There are several powerful libraries that render SVG without OpenGL. I wonder if it's not really that necessary: maybe drawing lines is already accelerated enough on most systems' graphics cards.
