database,distributed,Apache - open source projects

Cassandra - Scalable Distributed Database

HBase - Hadoop database

Crate - The fast, scalable, easy to use SQL database with native full text search

Titan - Scalable Graph Database

SpiceDB - Inspired by Google's Zanzibar paper, SpiceDB is a database system for managing security-critical application permissions

FlockDB - A distributed, fault-tolerant graph database from Twitter

Apache Accumulo - Key Value Store based on Google BigTable

Nebula Graph - A distributed, scalable, lightning-fast graph database

SenseiDB - Distributed, Realtime, Semi-Structured Database from LinkedIn

Cloudata - Structured Data Storage implementing Google's Bigtable.

ConcourseDB - Self-tuning database designed for both transactions and ad hoc analytics across time