Dolt is a SQL database that natively supports Git semantics like commits, branches, and merges. It uses a custom engine that versions table rows not files so diffs and merges are fast. The structural sharing of rows across versions allows Dolt to scale to large table sizes.
DoltHub is to Dolt as GitHub is to Git. The data community can post and collaborate on open databases much as the open source community collaborates on open source.
Over the next few months we're going to work really hard to publish open, maintained, and updated data on DoltHub that you can't easily get anywhere else on the internet. Think every LinkedIn resume on CommonCrawl. Between now and then, we'd love it if people signed up for DoltHub and helped us seed the open data ground.
We're hoping the HackerNews community enjoys what we've built :-)