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Redis
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.
> Many people had contributed their efforts to the Redis project for free
The bulk of the code was written by antirez with only ~12 others exceeding 100+ commits [1]. And if you continue scrolling the number of commits-per-user drops off fast. It's striking given how famous the project is.
[1] https://github.com/redis/redis/graphs/contributors
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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valkey
A flexible distributed key-value database that is optimized for caching and other realtime workloads.
There are a bunch of contributors listed on this page who seem to predate the fork and who have continued to contribute:
https://github.com/valkey-io/valkey/graphs/contributors
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Initially to a PolyForm license[1], which I then forked to create my own[2]. I informally refer to it as an "edu source" license (the source available is primarily available for educational purposes).
[1]: https://polyformproject.org/licenses/strict/1.0.0/ (hn discussion: https://news.ycombinator.com/item?id=24804223)
[2]: https://github.com/LGUG2Z/komorebi-license
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garnet
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.
Microsoft also last year released their own Redis-client-compatible key-value store, Garnet: https://github.com/microsoft/garnet
