sympathor has compassion with those trying to obtain a symbolic description of paths described by the SVG 2 specification.
At reasonable size, sympathor enables you to extract a fully symbolic description of paths from MIME types text/plain or image/svg+xml. Based on this symbolic description, you can obtain a sampled path for further numerical processing, the path's natural parametrization, its Frenet frame, etc.
In short, sympathor seeks to single-handedly provide properties and quantities of differential geometry at high precision.
For a quick start guide, documented examples and details on the API of sympathor see the documentation.