Valkey
A flexible distributed key-value datastore that supports both caching and beyond caching workloads.
Redis
Redis is an open-source, in-memory database, cache and message broker.
ScyllaDB
ScyllaDB is a true NoSQL database for the most demanding applications.
OpenSearch
Open source distributed and RESTful search engine.
Cassandra
Open Source NoSQL Database
FerretDB
Documents DB, built on Postgres. FerretDB allows you to use MongoDB drivers seamlessly with PostgreSQL as the database backend. Use all tools, drivers, UIs, and the same query language and stay open-source.