vectorize-io/hindsight: SOTA Agent Memory System Backed by arXiv Paper — 4K Stars, PyPI + NPM

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Hindsight (4K stars, 1.5K weekly) is an agent memory system from Vectorize with an academic paper (arXiv:2512.12818) claiming state-of-the-art on long-term memory benchmarks, outperforming RAG and knowledge graphs. The key distinction: it's designed to 'learn, not just remember' — generalizing from past interactions rather than verbatim retrieval. MIT license, available as both pip install hindsight-api and @vectorize-io/hindsight-client NPM package. Most academically grounded agent memory product seen in this scan.