Sigrok is an excellent project but the maintainers got burnt out and it's been frozen for a couple of years. I believe the most urgent need is for reviews - it has a number of outstanding PRs but they really need reviewing before adding, in order to keep the codebase consistent (which is an excellent aim to have but is slowing adoption).
There are, I think, also many projects that need more or improved documentation. It's not just designers, coders and testers that are needed.