Redis

Valkey

valkey-io/valkey

Trending

Linux Foundation, BSD-licensed fork of Redis adopted by AWS, Google Cloud and major Linux distros.

Memcached

memcached/memcached

Simple, battle-tested distributed memory cache for key-value lookups.

Dragonfly

dragonflydb/dragonfly

Rising

Multi-threaded, Redis- and Memcached-compatible in-memory store built for high throughput.

Garnet

microsoft/garnet

Microsoft Research's RESP-compatible cache store in .NET with high throughput and low latency.

Caffeine

ben-manes/caffeine

Popular

High-performance in-process caching library for Java, successor to Guava's cache.

KeyDB

Snapchat/KeyDB

Legacy

Multi-threaded Redis fork from Snap; development has slowed and Valkey/Dragonfly are preferred.

Pinecone

pinecone.io

Popular

Fully managed serverless vector database; the most common managed choice for production RAG.

pgvector

pgvector/pgvector

Popular

PostgreSQL extension for vector similarity search with HNSW and IVFFlat indexes; vectors next to your data.

Qdrant

qdrant/qdrant

Popular

Rust vector database with rich payload filtering, quantization and hybrid search; self-hosted or cloud.