Penpot
Penpot is an open-source design and prototyping platform that has integrated AI-assisted features for layout generation, component creation, and design system management. As the leading open-source alternative to Figma, it supports real-time collaboration, SVG-native workflows, and CSS-based design properties that align with web standards. Penpot is favored by teams who want full control over their design toolchain with self-hosting options.