Eight Open Source Tools That Cover Every Layer of AI Agent Memory

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Building AI agents with reliable memory requires four distinct capabilities: raw event storage, fact extraction, token-bounded retrieval, and an orchestration loop. No single tool handles all four well, which is why developers typically need to combine multiple solutions across the memory and orchestration layers. Tools highlighted include Statewave for memory runtime, Mem0 for quick user-memory integration, Graphiti for temporal knowledge graphs, and Cognee for ontology-grounded knowledge graphs. All listed tools are licensed under Apache-2.0, MIT, or the PostgreSQL License, verified from source files as of September 1, 2026. The most common mistake when building agent memory stacks is selecting two tools that duplicate the same layer while leaving another layer entirely uncovered.

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