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PlantUMLclang-uml
Free

Free and open source under the GPL.

 Free

Free and open source under the Apache-2.0 license.

Windows, macOS, Linux, Web, Command line Command line
  • Covers far more diagram types than most text-based tools
  • Integrations for nearly every editor, wiki and documentation system
  • Generates multiple UML diagram types
  • Exports to PlantUML, MermaidJS, GraphML, and JSON
  • Requires Java and, for some diagram types, Graphviz
  • The syntax is inconsistent between diagram types
  • Focused on C, C++, and Objective-C code
Downloadable app, Web application Downloadable app
Open source Open source
License: GPL-3.0 License: Apache-2.0
Not stated if an account is needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked September 22, 2026

Checked October 8, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.