Inkscape
Debian experimental v1.0~beta2-1 ships py3 deps, ubuntu focal v0.92.4-5ubuntu2 still depends on py2 (as of 2019-12).
The snap package has some restrictions i.e. extensions.
Extensions
Extension gallery Extension development
Map scale plugin
https://inkscape.org/~Moini/%E2%98%85realscale-resize-by-line-of-known-length https://gitlab.com/Moini/inkscape-realscale-extension