Best Open Source Alternatives to Marvel

Penpot is an open-source UI/UX design and prototyping tool that replaces Figma with web standards, native CSS Grid layouts, and self-hosted control.

vs Marvel: a free, open-source option you fully control, licensed MPL-2.0.

Pencil Project is an open-source desktop wireframing tool that replaces paid UI suites with offline, stencil-based GUI prototyping for everyone.

vs Marvel: a free, open-source option you fully control, licensed GPL-2.0.

Quant-UX is an open-source prototyping and usability testing platform that replaces tools like UXPin and Figma with self-hosted session analytics.

vs Marvel: a free, open-source option you fully control, licensed GPL-3.0.