We're a nonprofit building a totally free platform of tools for artists and labels to sell, share, and promote music directly to their audiences. It's something we've been working on for a long time because we feel it's vital that all musicians have access to basic web tools that are free, open, and theirs to own.
Here's a short list of developer resources, with more to come. If you're interested in helping, just say hi: dev@cashmusic.org.