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Protégé

Ontology editing environment.

  • Completely free
  • Linux
  • Open source

At a glance

All of Protégé is free: no feature is locked behind a paid plan, and its code is open.

Its licence (BSD-3-Clause) is a permissive open source licence: use, modification and redistribution are allowed, including in commercial projects.

Strengths

  • Open source code
  • Commercial use allowed

About

Protégé Desktop is a feature rich ontology editing environment with full support for the OWL 2 Web Ontology Language, and direct in-memory connections to description logic reasoners like HermiT and Pellet. Protégé Desktop supports creation and editing of one or more ontologies in a single workspace via a completely customizable user interface. Visualization tools allow for interactive navigation of ontology relationships. Advanced explanation support aids in tracking down inconsistencies. Refactor operations available including ontology merging, moving axioms between ontologies, rename of multiple entities, and more.

Description from Flathub — AppStream (Flathub)

Sources and checks

  • Facts collected from Official plan pages (pricing, licence, terms) (commercial use) —
  • Facts collected from Flathub (credit card, source code, publisher, licence, free status, platforms, commercial use, version) —
  • Last technical check: 8 November 2026
  • Description from Flathub — AppStream (Flathub)

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