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Various tools that are preferably and primarily OSS for designers to use in developing Open Source Software.
Penpot.app: Collaborative UI design prototyping and design system creation tool (alternative to Figma and Adobe XD) Interactive content or app. Able to be self-hosted.
Excalidraw: A great intuitive and attractive tool for easy imaging/chartm-aking.
Updated on 14 Feb 2022