Ask HN: Open-Source Projects to Contribute To?

I'm a web developer who has been recently furloughed due to COVID. Since I have some time, I was looking to see if there were any open source projects I could contribute to that need web developers. I would like to contribute to a project that is actively being used & worked on. I'm interested in hearing any ideas. My experience is mainly PHP, python and javascript but I am open to learning new languages and frameworks. The end goal is mainly to keep my skills sharp and have something to show for the time.