The best-benchmarked open-source AI memory system. And it's free.
For developers, who are building real-time data-driven applications, Redis is the preferred, fastest, and most feature-rich cache, data structure server, and document and vector query engine.
Milvus is a high-performance, cloud-native vector database built for scalable vector ANN search
HydraDB - fast graph database on object storage
A library that provides an embeddable, persistent key-value store for fast storage.
HeavyDB (formerly MapD/OmniSciDB)
High performance data store solution