Urbit OS is a hosted operating system programmed in the Hoon functional language which runs on the Nock virtual machine. Urbit OS operates as a state machine with a discrete event log providing strong guarantees about building and evaluating code.

• Urbit developer portal
• Hoon School (the programming language guide)
• App School (the application development guide, part 1)
• App School: Full-Stack (the application development guide, part 2)
• Urbit on Github
• Urbit S3 Hosting

Besides building apps directly using the Urbit OS platform, you can also work with the Urbit ID system Azimuth, an ERC-721 non-fungible point, or its wrapped equivalent $WSTR. Azimuth points also correspond to unique NFT-like digital avatars called sigils.

• Azimuth on Github