eXist-db

eXist‑db is an open‑source native XML database engine that also serves as a full‑stack application platform. It stores XML documents directly, offering a schema‑less data model and a browser‑based IDE for developing and managing applications. The system includes a forms framework, a library stack, and support for rapid prototyping, allowing developers to build web sites, content‑management systems, and collaborative workflows without an external relational layer.

The platform is targeted at developers and institutions that work extensively with XML standards such as TEI, and who need to store, query, and present large collections of structured documents. It is used by government archives, academic research projects, and publishing platforms that require high‑performance search and browsing of tens of thousands of archival records.

Key distinguishing aspects are its all‑in‑one approach—combining data storage, query processing, and application tooling in a single package—and its community‑driven development under an LGPL license. The software runs on macOS and offers a stable, production‑ready environment for XML‑centric applications.