concurrent

Garnet is a remote cache-store from Microsoft Research that offers strong performance (throughput and latency), scalability, storage, recovery, cluster sharding, key migration, and replication features. Garnet can work with existing Redis clients.

the champagne of beta embedded databases

Fast persistent recoverable log and key-value store + cache, in C# and C++.

Blazing fast concurrent HashMap for Rust.

A high-performance web server for Ruby, supporting HTTP/1, HTTP/2 and TLS.

A lock-free, in-memory fuzzy search engine for Kotlin Multiplatform. L2-normalized sparse vector embeddings with O(1) cosine similarity — handles typos, transpositions, and blind continuation. Zero-allocation search via primitive arrays, reactive StateFlow results, and instant cold-start via JSONL import/export.