utopia
Open-source bitemporal knowledge graph that tracks how understanding changed over time
Utopia is a self-hosted knowledge graph and RAG system built on one Rust binary and one Postgres instance, storing not just current facts but the full history of how they changed (a bitemporal graph), with conflict detection and an ontology workbench. It ingests PDFs, Office files, web pages, GitHub, Jira and S3 buckets, and can run fully air-gapped against any OpenAI-compatible endpoint including local models like Ollama or vLLM. It's free and open source, 3.7k GitHub stars.
What holds up
- +Runs fully air-gapped with any OpenAI-compatible endpoint, including local models like Ollama or vLLM
- +Single Rust binary plus Postgres — no separate vector database or job queue service to run
- +Bitemporal design keeps the full history of how a fact changed, not just its current value
Mind the limits
- −Free and open source, so there's no vendor support contract if something breaks in production
- −Self-hosted setup (Rust binary, Postgres, ontology config) needs infrastructure comfort, not a hosted SaaS option
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