Hey @Ettore_Lorenzi welcome to the community. - feel free to Introduce yourself 
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Freecad occasionally pops up as a request, and ive merged yours with a previous one.
Despite doing quite well in our polling a while ago - our hope that the many open source aec devs we hear working with Freecad could corral to work on a connector for the community hasn’t materialised.
Really happy to hear your successful with rhino + gh - Speckle team is concentrating hard on expanding and polishing our existing connectors so thanks for your bump on this perhaps it could kick start things in the community interest.