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Heimer vs Freeplane: catalog facts
Heimer	Freeplane
Free The open-source software is available without a license fee. Hosting, hardware and…	Free Free and open source under the GPL.
Windows, Linux	Windows, macOS, Linux
Supports automatic layouts and image exports.	Attributes, conditional styles, filtering and scripting go well beyond drawing a diagram Groovy scripting can generate or transform entire maps
It is a diagramming tool rather than a full document editor.	A dense interface with a real learning curve Java Swing looks and feels out of place on every platform
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-2.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 21, 2026

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