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I've already implemented an SVG renderer at https://www.amanithsvg.com based on our openvg engine with software rasterization https://www.amanithvg.com

Both are closed source, but there are evaluation version available, if someone is interested in compare rendering quality and speed.

Why did you name a closed source product openX? :)

The name is AmanithVG and it is an implementation of OpenVG (a standard API for 2D vector graphics from Khronos group).

Can you recommend some resources for someone trying to do the same?

You can look at software rasterization from good opensource libs: Freetype, Agg, Cairo.