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D2PlantUML
Free

Free and open source under the Mozilla Public License 2.0.

 Free

Free and open source under the GPL.

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

Checked October 2, 2026

Checked September 22, 2026

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