Oxigraph vs Protégé

Oxigraph is a free graph database and RDF/SPARQL toolkit available for Linux, web, API, and self-hosted use. It implements SPARQL 1.1 Query, Update, and Federated Query, and handles RDF formats including Turtle, TriG, N-Triples, N-Quads, RDF/XML, JSON-LD, and N3. The project provides a Rust library, standalone Rust crates, Python bindings, JavaScript bindings, and a command-line tool. That CLI can start an HTTP server implementing the SPARQL 1.1 Protocol and Graph Store Protocol. By default, the server listens on localhost:7878 and offers a YASGUI-based HTML interface for running SPARQL requests. REST endpoints support queries, updates, and RDF dataset access. Installation options include Cargo, Docker, PyPI, conda-forge, and prebuilt binaries. Pyoxigraph supplies in-memory and disk-based stores, and oxrdflib connects rdflib stores to Pyoxigraph. Storage is based on RocksDB, and licensing is Apache 2.0 or MIT.

Protégé is a free ontology editor for building and managing ontologies, offered as Protégé Desktop and the browser-based WebProtégé. Both editions support OWL 2 and are described as cross-compatible. WebProtégé supports collaborative viewing and editing, with sharing, permissions, threaded discussions, watches, email notifications, and revision history. Ontologies can be uploaded and downloaded in formats including RDF/XML, Turtle, OWL/XML, and OBO. Protégé Desktop connects directly to description logic reasoners such as HermiT and Pellet. It can keep multiple ontologies in one workspace and provides structure visualization, inference explanations, and refactoring operations. Desktop is written in Java and can be extended with plug-ins. The project provides documentation including FAQs, tutorials, user guides, and developer documentation. Free support is available through mailing lists monitored by team members and experienced community users; users must subscribe before posting. The project says researchers, organisations, and governments worldwide use Protégé. Desktop is community maintained, with Damien Goutte-Gattat identified as its current primary maintainer.