penpot.app
Open-source design and prototyping tool, built to work with developers.
Strengths
- Free and open source, with no limit on files or editors
- Can be self-hosted to keep your data in-house
- Based on web standards (SVG, CSS) for easy developer handoff
Limitations
- Less polished and a bit slower than Figma
- Smaller ecosystem of plugins and community files
- Fewer integrations with other tools
