1. LogDevice. https://logdevice.io/. LogDevice. https://logdevice.io/.
2. redis. https://redis.io/. redis. https://redis.io/.
3. Rocksdb. https://rocksdb.org/. Rocksdb. https://rocksdb.org/.
4. Sqlite. https://www.sqlite.org/. Sqlite. https://www.sqlite.org/.
5. Fast key-value stores