The goal of the VRR project is to create a vector image editor designed especially (but not only) for making illustrations of mathematical articles. Its main features are many types of geometric objects and keeping of their dependencies, cooperation with TeX, scripting in Scheme, real-size dimensions, support for a wide range of file formats (including PS, EPS, PDF, and SVG). Reproducible: Always
There haven't been any new releases since March 2007 and the latest available version does not compile on my system due to conflicting types; I haven't tried fixing the problem so I don't know how difficult it would be. Last but not least, there is media-gfx/inkscape. Is there still any user demand for this package?