Ask HN: What are some impactful, small-team, software projects?

Hello HN,

I'm working to find a purpose; contributing to or creating an impactful software project might help.

As an example, SciHub provides free, convenient access to research (usually funded by public money, so it's not that illegal), which contributes to advancing science.

What are some impactful, small-team, software projects that you know, or would like to exist? Thanks