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fstl-e vs F3D: catalog facts
fstl-e	F3D
Free Free and open source under the MIT licence.	Free Free and open source.
Linux	Web
Opens STL files quickly Configurable background	Opens many 3D and CAD formats in one viewer Gaussian splatting and volume rendering support
Viewer only, no editing Small fork maintained by one developer	A viewer, not an editor Minimal interface with few editing features
Downloadable app	Downloadable app, Web application
Open source	Open source
License: MIT	License not stated
No account needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 23, 2026

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