Mentat - Persistent, relational store inspired by Datomic and DataScript.
RocksDB - Persistent Key-Value Store for Flash and RAM Storage.
goleveldb - LevelDB key/value database in Go.
TiDB - Distributed HTAP database compatible with the MySQL protocol.
Noria - Dynamically changing, partially-stateful data-flow for web application backends.
RethinkDB - Pushes JSON to your apps in realtime.
RedixDB - Persistent real-time key-value store, with the same redis protocol with powerful features.
AresDB - GPU-powered real-time analytics storage and query engine.
Sophia - Modern transactional key-value/row storage library.
Bolt - Pure Go key/value store inspired by Howard Chu's LMDB project.
InfluxDB - Scalable datastore for metrics, events, and real-time analytics.
EdgeDB - Open-source object-relational database built on top of PostgreSQL.
JanusGraph - Open-source, distributed graph database.
Algebraic Query Language - Schemas as categories, DB instances as functors, provable data migration as functor composition.
syncing-thesis - Syncing strategies for mobile apps.
Storage Performance Development Kit - Provides a set of tools and libraries for writing high performance, scalable, user-mode storage applications.
Let's Build a Simple Database - Writing a sqlite clone from scratch in C.
Readings in Databases - List of papers essential to understanding databases and building new data systems.
Dbmate - Lightweight, framework-agnostic database migration tool.
Designing Data Intensive Applications Book - Deep dives into different types of data storage solutions, their history, and how they actually work.
Scalable SQL and NoSQL Data Stores - Good paper that helps differentiate similar but different datastores. Really helpful when you're trying to pick a modern data solution.