Not yet tested but seems very cool! :)
Free : Tangram + Google Maps + 3D Builder (free integrated (?) or loadable inside Windows)
https://tangrams.github.io/heightmapper/

Tested just with an image! That is terrific of simplicity! One second realised! :)
And at the end you can save in several 3D formats! ;)




Was made with this FlowScape image!