Penpot is the first open-source design and prototyping tool that allows collaboration between teams of designers and developers. Penpot runs in a browser and has a very user-friendly intuitive interface that makes it possible to co-design, share and review all parts of a user interface. Its outcomes are depending on your objectives: (interactive) prototypes or feedback loops. The code-ready and familiar Flex Layout and Code Inspect tools make interaction and collaboration between designers and developers easy and productive. Penpot adheres to open standards and consequently delivers exchangeability and portability to other design or development platforms. Penpot can be deployed in the cloud and or-hosted.
Free on the Penpot web site (install on premisses or run in the cloud)