RegattaDB is described as 'Distributed SQL database that unifies transactional (OLTP), analytical (OLAP), and Vectors in a single engine, with strong ACID guarantees, at scale, performance, and efficiency' and is an app in the development category. There are three alternatives to RegattaDB for a variety of platforms, including Mac, Linux, BSD, Windows and Web-based apps. The best RegattaDB alternative is PostgreSQL, which is both free and Open Source. Other great apps like RegattaDB are MongoDB and CockroachDB.
PostgreSQL is a powerful, open source object-relational database system with over 35 years of active development that has earned it a strong reputation for reliability, feature robustness, and performance.
MongoDB is a document database with the scalability and flexibility that you want with the querying and indexing that you need
Cockroach is a distributed key/value datastore which supports ACID transactional semantics and versioned values as first-class features. The primary design goal is global consistency and survivability, hence the name.
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