https://github.com/datproject/dat
It's ~5 years old and I really wanted it to be huge. Hoping this new project is a success. Especially since I notice I went to high school with one of the founders of Dolt (Hey Tim!)
I'm not sure why you bring it up now. They don't call it "git for data" anywhere that I see, and it's missing 2 of the 3 core features that I think a "git for data" would need to have.
https://www.youtube.com/watch?v=FX7qSwz3SCk (2013) - 'Introducing Dat: If Git Were Designed For Big Data' Talk by the founder.
My point is they pivoted and so maybe this idea won't work, or this was too early.
EDIT: Looking back on _your_ post, I mentioned it because you specifically said "It's a program, and it appears to be an open-source one you can download and use today." And that is what 'dat' is/was. I thought I would mention it.
This is Git for data. It's a program, and it appears to be an open-source one you can download and use today.