DuckDB
DuckDB Foundation / DuckDB Labs · Analytical engines & OLAP
In-process analytical SQL database that queries Parquet, CSV and Arrow data directly from Python, R, Node or the CLI
MITOpen sourceFreeLocalSelf-hostedNov 2, 2026
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Kùzu
Kùzu Inc. (company acquired; project archived) · NoSQL & key-value stores
Embedded property-graph database with Cypher, vector and full-text search; MIT-licensed but archived in October 2025 after the company was acquired
MITOpen sourceFreeLocalDiscontinuedNov 2, 2026
SQLite
SQLite Consortium / Hipp, Wyrick & Company · Relational databases
Public-domain embedded SQL database engine that stores a whole database in one file and ships inside most operating systems and browsers
Open sourceOpen sourceFreeLocalNov 2, 2026
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