The 15 Best Open Source Design Tools in 2026

Last updated: August 2026

Open source in design used to mean "worse, but free." That stopped being true somewhere around 2023, and a few of the tools below are now the best option in their category regardless of price.

Fifteen genuinely open-source tools — meaning you can read the source, self-host it, and nobody can raise your rent or shut the service down.

Design and prototyping

Penpot is the open-source design and prototyping platform, and the only credible full Figma alternative. Free with no editor limits, self-hostable, and built on open web standards — designs are SVG under the hood rather than a proprietary format.

The pitch that lands hardest with teams right now is licensing: unlimited editors at no cost. For a team paying for a dozen Figma seats, that arithmetic is difficult to ignore. It remains behind Figma on plugin ecosystem and some advanced prototyping, but the gap is far narrower than most people assume.

Figr is a lighter-weight entry in the same space, worth watching as the category matures.

Whiteboards and diagramming

Excalidraw is the hand-drawn-style whiteboard that became the default for technical diagramming. Free, open source, self-hostable, with end-to-end encrypted collaboration. The deliberately sketchy aesthetic does real work — it signals "this is a draft," which keeps people arguing about the idea instead of the rounded corners.

tldraw is the more polished infinite canvas, and its SDK is genuinely excellent if you want to embed a canvas in your own product. Also the most fun to use of anything on this list.

Website building

Webstudio is the open-source visual site builder — a Webflow-shaped tool you can self-host with no per-site fees. If you build client sites, this is the only option here that lets you hand over complete ownership rather than trapping the client in your account.

Plasmic has an open-source core and solves the visual-editing-on-a-real-codebase problem. Not fully open source across every tier, but the foundation is.

Components and design systems

shadcn/ui changed how people think about component libraries. You don't install it as a dependency — you copy the components into your project and own them outright. No version upgrades to fight, no unstyleable internals. It's become the default foundation for a large share of new React projects, and most AI code generators now target it.

TailGrids is an open-source React and Tailwind component library with broader coverage than most free kits bother with.

Uiverse is a community library of open-source CSS components — buttons, loaders, cards, toggles. Uneven by nature, useful for the small interactive pieces nobody wants to build from scratch.

Icons

Lucide is MIT licensed, over a thousand icons, consistently drawn, with packages for every major framework. It's the open-source default and it's also simply the best general-purpose icon set available.

Iconoir is completely free with no paid tier and no attribution requirement — a genuinely rare combination — with slightly more character than the flatter sets.

Supercons is a small friendly React iconset worth knowing about.

Raster, vector and 3D

Blender is not "the open-source 3D tool." It's one of the industry standard 3D tools, used in film, games and product visualisation, that happens to be free. For designers, it's the deepest option available for 3D product renders and motion work — with a learning curve to match.

GIMP is the long-running open-source raster editor. Honest assessment: it's capable and free, and its interface still fights you in ways Photoshop and Affinity don't. Fine for occasional work, frustrating as a daily driver.

Recordly is an open-source screen recorder across macOS, Windows and Linux — the free, cross-platform counterpart to the polished commercial recorders.

Why this matters beyond price

Ownership. A self-hosted site cannot be shut down, price-hiked, or acquired out from under you.

Client handover. You can transfer a Webstudio site to a client completely. You cannot transfer a Framer or Webflow site without transferring an account relationship.

Format longevity. Penpot files are SVG. In fifteen years, something will still open an SVG.

No seat tax. For teams, unlimited editors is often the entire business case on its own.

We catalogue open-source tools across every category — see design tools, icons and UI kits, or read our comparison of Figma vs Penpot.