Amazon Aurora vs FoundationDB

Amazon Aurora is a MySQL and PostgreSQL-compatible relational database service built for the cloud, offered as part of Amazon Web Services. It provides up to five times the throughput of standard MySQL and three times that of PostgreSQL with automatic scaling, replication, and backup.

FoundationDB is a databases tool that distributed key-value store from apple providing acid transactions across a scalable, fault-tolerant cluster. It is open source software.