PostgREST is a standalone web server that turns your PostgreSQL database directly into a RESTful API. The structural constraints and permissions in the database determine the API endpoints and operations.
kanister - An extensible framework for application-level data management on Kubernetes
Dotmesh captures snapshots from stateful Docker and Kubernetes applications as ’datadots‘, and gives you the ability to label, store and share them as you would with version-controlled code. Dotmesh is an open–source primitive that can be accessed via CLI or API.
rqlite - The lightweight, distributed relational database built on SQLite.
cockroach - CockroachDB - the scalable, survivable, strongly-consistent SQL database
Bedrock is a simple, modular, WAN-replicated data foundation for global-scale applications.
Citus turns Postgres into a distributed database. It enables you to transparently shard your data across multiple Postgres instances, then provides multiple executors to query across your entire dataset.
The result is that you can seamlessly scale out Postgres and still have all the great features that PostgreSQL provides.
ActorDB is strongly consistent, distributed and horizontally scalable.
This article contains information on known problems and limitations of MariaDB Galera Cluster
This is an attempt to build a fairly comprehensive list of metrics you should be monitoring on a PostgreSQL 9.4 database server