Our World In Data is the largest open source data collection & analysis that I'm aware of. https://github.com/owid

The 80000 Hours podcast has an interview with the (non-technical) creator of OWID. I seem to recall some interesting stories about them getting emailed PDFs with COVID data and such.

I had the same question as you, and I was hoping to find ideas in the comments. It seems like the kind of thing that's both inherently messy and scrappy yet if you don't get at least somewhat organized it can't scale.

Update: link to the podcast episode page with quotes, transcripts, etc. https://80000hours.org/podcast/episodes/max-roser-our-world-...