KeyDB: https://keydb.dev/: KeyDB is a high performance fork of Redis with a focus on multithreading
ardb: https://github.com/yinqiwen/ardb: Ardb is a redis-protocol compatible persistent nosql
kvrocks: https://github.com/KvrocksLabs/kvrocks: Kvrocks is an open-source key-value database which is based on rocksdb and compatible with Redis protocol
Titan: https://github.com/distributedio/titan: A distributed implementation of Redis compatible layer based on TiKV
codis: https://github.com/CodisLabs/codis: Codis is a proxy based high performance Redis cluster solution written in Go
pika: https://github.com/OpenAtomFoundation/pika: Pika is a persistent huge storage service , compatible with the vast majority of redis interfaces
ssdb: https://ssdb.io/: A high performance NoSQL based on LevelDB and supporting many Redis data structures
