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UmbrelloGaphor
Free

Free and open source under the GPL-2.0 or later.

 Free

The software is free under its open-source licence. Hosting, hardware and external…

Windows, Linux Windows, macOS, Linux
  • Supports nine UML and ER diagram types
  • Generates code from diagrams in several languages
  • It keeps a real UML 2 data model behind the diagrams, so elements are reused across views rather…
  • No macOS build listed
  • Interface follows KDE conventions that may feel unfamiliar outside Plasma
  • It is a modelling tool rather than a quick diagram editor, and it does not generate code from…
Downloadable app Downloadable app
Open source Open source
License: GPL-2.0-or-later License: Apache-2.0
No account needed Not stated if an account is needed
Works offline Not stated if it works offline

Checked October 1, 2026

Checked September 22, 2026

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