KeyDB
A Multithreaded Fork of Redis
...Apart from multithreading it offers such features as multi-master replication, persistence capabilities, horizontal and vertical scalability and direct backup to AWS S3 right out of the box. KeyDB remains fully compatible with Redis protocol, modules, and scripts, including the atomicity guarantees for scripts and transactions. Keeping in sync with Redis development, it is a superb drop in replacement for existing Redis deployments.