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clang-umlPlantUML
Free

Free and open source under the Apache-2.0 license.

 Free

Free and open source under the GPL.

Command line Windows, macOS, Linux, Web, Command line
  • Generates multiple UML diagram types
  • Exports to PlantUML, MermaidJS, GraphML, and JSON
  • Covers far more diagram types than most text-based tools
  • Integrations for nearly every editor, wiki and documentation system
  • Focused on C, C++, and Objective-C code
  • Requires Java and, for some diagram types, Graphviz
  • The syntax is inconsistent between diagram types
Downloadable app Downloadable app, Web application
Open source Open source
License: Apache-2.0 License: GPL-3.0
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 October 8, 2026

Checked September 22, 2026

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