These are projects being worked on by other people, that are sufficiently exciting for me to check up on them often. You might find something here that interests you too.
Marginalia – An independent DIY search engine that focuses on non-commercial content, and attempts to show you sites you perhaps weren’t aware of in favor of the sort of sites you probably already knew existed.
Playbit — A DOM-like data structure for building collaborative software that works just as well while connected to the Internet as when running offline locally.
Seeds of Science — A new scientific journal and community that aims to address issues in the publishing landscape by providing a peer-reviewed platform for non-traditional scientific writing.
Farcaster — A sufficiently decentralised social protocol.