Looking for recommendations from the HN community on where one would start.

On the technical side I'm interested in suggestions regarding:

* Open Source / Community Projects

* Companies / Organisations / Startups working on promising innovative research or products in disruptive sustainability

On the community / activist side, I'm looking for:

* Activist groups that lobby for change and sustainable practices, where computer science skills might be able to contribute

* EU / UN projects where such a skillset might be useful

Any other general advice welcome. I'm tired of writing code for ad-tech while the world burns, and I suspect there are others like me who would like to get more involved, hence this post.