InterSystems IRIS is described as 'A complete cloud-first data platform that includes a multi-model transactional data management engine, an application development platform, and interoperability engine, and an open analytics platform' and is a relational database in the development category. There are more than 10 alternatives to InterSystems IRIS for a variety of platforms, including Windows, Linux, Mac, BSD and Self-Hosted apps. The best InterSystems IRIS alternative is SQLite, which is both free and Open Source. Other great apps like InterSystems IRIS are PostgreSQL, MySQL Community Edition, MongoDB and MariaDB.