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kvrocks
Apache Kvrocks is a distributed key value NoSQL database that uses RocksDB as storage engine and is compatible with Redis protocol.
Another under the radar Apache project I've found myself using is Apache KvRocks
https://github.com/apache/kvrocks
It's a Redis compatible database on top of RocksDB, so unlike Redis it uses the disk instead of RAM, but you can control how much data is cached in RAM, obviously Kvrocks will be slower than Redis for uncached data.
Useful in situations where you want a KV data store that isn't limited by your memory specs but is compatible with everything that speaks Redis.
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InfluxDB
Purpose built for real-time analytics at any scale. InfluxDB Platform is powered by columnar analytics, optimized for cost-efficient storage, and built with open data standards.
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Cool. This post is right beside the 37signals one[1] that mentions SolidCache[0].
I discovered two solutions in one day.
[0] https://github.com/rails/solid_cache
[1] https://news.ycombinator.com/item?id=38710927