Protégé Alternatives

Protégé is described as 'Free, open source ontology editor and knowledge-base framework' and is an app in the office & productivity category. There are eight alternatives to Protégé for a variety of platforms, including Windows, Web-based, Mac, iPad and Linux apps. The best Protégé alternative is TheBrain, which is free. Other great apps like Protégé are Visual Understanding Environment, Fluent Editor, Onto4ALL and CmapTools.

More about Protégé

Protégé alternatives page was last updated Jan 9, 2026

TheBrain
142 likes
TheBrain helps you organize all your Web pages, contacts, documents, emails and files in a context-driven visual map.
129 TheBrain alternatives
Cost / License
Freemium
Proprietary
Application type
Mind Mapping
Origin
United States
Platforms
Mac
Windows
Online
Android
iPhone
Android Tablet
iPad
+2
Is TheBrain a good alternative to Protégé?
Visual Understanding Environment
85 likes
Visual Understanding Environment (VUE) is a mind-mapping and concept-mapping tool. It is also a non-linear presentation program.
Cost / License
Free
Open Source
Application type
Mind Mapping
Origin
United States
Alerts
Discontinued
Platforms
Mac
Windows
Linux
+1
Is this a good alternative to Protégé?
Fluent Editor
2 likes
An ontology editor focused on providing a seamless experience for users working with OWL ontologies. It supports the editing of structured ontologies and offers various validation and reasoning tools.
Cost / License
Free Personal
Proprietary
Origin
Poland
EU
Platforms
Windows
+1
Is Fluent Editor a good alternative to Protégé?
Onto4ALL
1 like
Onto4ALL Is a free graphical editor capable of creating, editing and exporting ontologies being guided by an warnings console, an ontological building rules tab and an extensive palette of ontological classes and relationships.
Cost / License
Free
Open Source (Apache-2.0)
Origin
Brazil
Platforms
Online
+3
Is Onto4ALL a good alternative to Protégé?
CmapTools
48 likes
concept maps on servers, edit their maps synchronously (at the same time) with other users on the Internet, and search the web for information relevant to a concept map.
45 CmapTools alternatives
Cost / License
Free
Proprietary
Application type
Mind Mapping
Platforms
Mac
Windows
Linux
iPad
Is CmapTools a good alternative to Protégé?
Datagraphs
1 like
Knowledge graphs.
Cost / License
Paid
Proprietary
Platforms
Online
Is Datagraphs a good alternative to Protégé?
3D Topicscape
7 likes
3D Topicscape is a Personal Information Manager that provides a template loosely based on mind-mapping or concept mapping. It presents the mind map as a 3D scene where each node is a cone (or pyramid, or variation on such a shape). It can also display in a 2D format.
Cost / License
Freemium
Proprietary
Application type
Mind Mapping
Origin
United Kingdom
Platforms
Windows
Is 3D Topicscape a good alternative to Protégé?
Unilexicon
2 likes
Unilexicon™ a visual editor and taxonomy manager for authoring controlled vocabularies with a content tagging extension.
Cost / License
Free
Open Source (MIT)
Platforms
Online
Is Unilexicon a good alternative to Protégé?