nosql
(3)
Couchbase
Couchbase is an enterprise NoSQL database company whose distributed, document-oriented platform powers low-latency, high-throughput applications for large organizations. Its flagship products - Couchbase Server, the fully managed Capella database-as-a-service, and Couchbase Mobile/Lite for edge and offline use - combine key-value speed, JSON flexibility, SQL-style querying (SQL++/N1QL), full-text and vector search in a single system. Founded in 2009 and long a rival to MongoDB, Couchbase went public on Nasdaq in 2021 and was taken private by Haveli Investments in a $1.5 billion deal in September 2025.
Redis
Redis is the company behind the world's most popular in-memory data store, the open-source database that began as a side project by Salvatore Sanfilippo in 2009 and now sits in the stack of most of the internet's largest applications. It sells managed and self-hosted enterprise versions - Redis Cloud and Redis Software - layered on the open-source core, and has pushed hard into real-time AI use cases like vector search and LLM memory. After a turbulent 2024 licensing fight that spawned the AWS-backed Valkey fork, Redis returned to an open-source license (AGPLv3) with Redis 8 in 2025.
Yugabyte
Yugabyte builds YugabyteDB, the open-source distributed SQL database designed for mission-critical cloud-native applications. Founded in 2016 by three ex-Facebook engineers who built Cassandra and HBase, Yugabyte combines full PostgreSQL compatibility with the horizontal scalability and fault tolerance of modern distributed systems. Deployed in 100+ countries and trusted by Fortune 100 companies including GM, Kroger, Shopify, and Charles Schwab, YugabyteDB handles over 1 million transactions per second while surviving node, zone, and region failures automatically. A $1.3B unicorn backed by Lightspeed and Sapphire Ventures, Yugabyte is the rare database company that made its entire core product fully open source - and built a thriving enterprise business around it anyway.