Cairn

Cairn was a self-hosted, persistent memory platform designed for both AI agents and humans. It provided long-term storage and retrieval of knowledge, decisions, and work artifacts across projects and sessions. With integrations for major IDEs, full-text and vector search, knowledge graph support, and advanced features like belief tracking, code intelligence, and work item management, Cairn was ideal for developers, researchers, and teams wanting a flexible and structured external memory system for their AI-augmented workflows.