A now-defunct company which hoped to build tools for thought, augmented by AI agents. One of the big ideas was that you would have a conversation with yourself from the past, using your notes as a conversational corpus. Beyond that, you would be able to browse the notes from other folks in the ecosystem. In many ways, this is similar to other digital gardens, but was underpinned by several decentralized web technologies like IPFS, IPLD, UCAN, and DID.
I worked for them as an SRE.