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PlantUMLD2
Free

Free and open source under the GPL.

 Free

Free and open source under the Mozilla Public License 2.0.

Windows, macOS, Linux, Web, Command line Windows, Command line
  • Covers far more diagram types than most text-based tools
  • Integrations for nearly every editor, wiki and documentation system
  • Diagrams as text that fit into version control
  • Simple syntax with automatic layout
  • Requires Java and, for some diagram types, Graphviz
  • The syntax is inconsistent between diagram types
  • Requires learning the D2 syntax
  • Less fine control than drawing by hand
Downloadable app, Web application Downloadable app
Open source Open source
License: GPL-3.0 License: MPL-2.0
Not stated if an account is needed No account needed
Not stated if it works offline Works offline

Checked September 22, 2026

Checked October 2, 2026

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