Lots of scientists use GitHub to manage research data or code, and to host websites. This was never an ideal choice because GitHub is a single point of failure, a silo, and a profit-driven enterprise that can change its business model without prior notice or can be taken over at any time. The latter is happening now that Microsoft accounced that it will acquire GitHub. I am worried that GitHub will soon cease to be as useful as it has been, and generally, I prefer not to use Microsoft services.
There are FOSS alternatives that implement most (such as GitLab) or the most important features of GitHub (such as Gogs or Gitea). But what about those who cannot run their own instance? Are there lists of public instances of these free and open-source Git hosting solutions?