Penpot

Penpot is an open-source, web-based design and prototyping platform focusing on team collaboration. Similar to Figma in concept, it uses vector editing and layering for UI designs, plus interactive linking for simple prototypes. Because it’s open source, teams can self-host or use the cloud service. An asset library supports shared components and styles. Penpot’s emphasis on open standards fosters easy integration with developer workflows. Though still evolving, it suits organizations that prefer open-source solutions for app design, giving them control over data and customization without subscription fees.