AmberDB is described as 'High-performance, flat-file NoSQL database engine for Perl built on top of Berkeley DB (DB_File). It combines the speed of flat-file storage with enterprise features: schema-driven multi-dimensional indexing, ACID-compliant transactions with Strict Two-Phase Locking' and is an app in the development category. There are more than 10 alternatives to AmberDB for a variety of platforms, including Linux, Mac, Windows, BSD and Android apps. The best AmberDB alternative is SQLite, which is both free and Open Source. Other great apps like AmberDB are PostgreSQL, MySQL Community Edition, MongoDB and MariaDB.
UnQLite is a in-process software library which implements a self-contained, serverless, zero-configuration, transactional NoSQL database engine. UnQLite is a document store database similar to MongoDB, Redis, CouchDB etc.
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