Certainly not as much as I used to, but yes I contribute to open source projects. It's a combination of making things I'm interested in, drive by patches for tools that almost do what I want or have a bug that I've managed to trigger, and chatting with others building things they're interested in. Being a maintainer is a different ballgame than contributing to a project without the long term responsibility, though both can scratch an itch and help develop new skillsets while helping to create new pieces of software.