Stackshare could be a basic source, as an example, check Airbnb:

http://stackshare.io/airbnb/airbnb

(so a company imports its Stackshare profile & you make a list of the open source projects they're using, and if you have donation information from those projects you show it)

That's a superb idea, but I think that would happen after first getting the basic donation information. I will set up a website to gather this with a description of what the project is trying to accomplish, and see if it gets any traction.

I think http://donate.money would be a great place for this.

Yes, let me know, I'll be happy to help and/or continue the brainstorming You can ping me: matias AT insaurral.de :D

Thanks! I'll shoot you an email

I think the first step is a website that has all of the donation information. This has a search engine to query projects, and the ability to submit / edit information like a wiki. This step needs to happen first. Once this is working, you can start building tools off of this information, like the rest API and the scanning tool.