Excalidraw
Hand-drawn style virtual whiteboard for diagrams, sketches, and collaborative brainstorming
Open source Figma alternative for UI design and prototyping — browser-based, no installation
Penpot is the open source design tool that's gaining real traction as a Figma alternative. It runs in the browser with real-time collaboration, uses SVG as its native format (which means design-to-code handoff is genuinely clean), and includes every feature you need for UI design and prototyping. The biggest selling point is the pricing: there's no per-editor fee, no premium tier locking features, no surprise bills at the end of the month. Self-hosting it means complete data control. What makes Penpot interesting is how it approaches design differently from Figma — the flex layout system is more web-native, which means designs translate to actual HTML more naturally. It's not as mature as Figma yet, and some power users will miss advanced features. But for most UI design tasks, it's more than capable, and the open source foundation means it can only get better.
Good first choice if you want a practical tool without spending the afternoon reading developer docs.
Switch from Figma's expensive per-editor pricing to a fully self-hosted alternative
Build and maintain consistent design systems with component libraries
Penpot is a good candidate for designers, teams who want an open source option in the design & creative category. The key question is not whether the repository is popular. The better question is whether it removes a real friction point from your day: replacing a paid SaaS tool, keeping more data under your control, speeding up a repeated task, or giving a team a workflow they can inspect and adapt.
Penpot is most useful when your goal matches one of its real use cases rather than when you are simply browsing popular repositories. Start by checking whether "escape figma pricing" sounds like your situation. If it does, read the install guide, try the smallest possible setup, and only then decide whether to bring it into a personal workflow or team stack. The project is tagged around design, figma-alternative, ui, prototype, which gives you a quick sense of the ecosystem it belongs to. It can also fit "design system creation", but that second path may require a different setup or expectation.
Penpot is one of the easier projects in this category to try first. You should still check the official installation page, but the expected path is closer to downloading an app, running a simple command, or following a guided setup than maintaining a complex server.
Check the MPL-2.0 license, the Clojure ecosystem, and the latest activity on GitHub before using it for important work.
Skip it for now if your current tool already solves the same problem well. Open source is most valuable when it gives you privacy, flexibility, cost savings, or a workflow improvement you cannot get from your existing setup.
If you are unsure, compare it with the similar projects below before spending time on a full setup.