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A bit of a shameless plug since it's my employer, we're super excited to go open source and make a distributed postgres available to everybody, happy to answer questions without any of the marketing speak from the blog.
osm-p2p is a decentralized peer-to-peer database for storing and editing OpenStreetMap nodes, ways, and relations. It includes a node.js server that implements the core functionality of the OSM API, or it can be used completely in the browser using IndexedDB for persistent storage.