Pencil is a standalone app that lets you create diagrams or UI mockups. It doesn't have collaboration/multi-user features.

An open source wireframe to app tool powered by Llama 3.2 vision. Upload a screenshot of a simple site/design & get code.

Sketch your app ideas without stress Make hand-drawn style wireframes quickly and easily.

Low-fidelity UI wireframing tool simulating sketching experience, optimized for speed with Quick Add, built for collaboration, drag-n-drop simplicity, exportable wireframes to PNG/PDF, interactive prototypes via linking, hundreds of UI components, reusable symbols, and more.

Feature-rich, open-source Wireflow offers a collaborative platform for online creation of complex user flow prototypes. Ideal for team work in UI design, wireframing, and mind mapping, promoting idea sharing in real-time environment aided by modern whiteboard features.

A streamlined web app that helps you create and collaborate in real-time on wireframes, mockups, diagrams and prototypes.

We believe the screen is the most important place in the world. That’s why we are dedicated to helping you deliver the best possible digital product experience, with our platform and best practices from your peers.

The collaborative design platform. Wireframe, prototype, design online and create design specs in one place. Or create an integration with our API.

Studio.Design is the site builder for designers. The browser app is packed with design features as intuitive as Figma, a CMS as simple as Notion, and one-click publishing to your domain. Now, you can finally turn any idea into a stunning website quickly and easily.

Origami Studio is a free design tool built by Facebook designers for creating interactive UI prototypes. An elegant, layer-based interface allows designers to repaidly create prototypes with layers, build interactions and then share them with others.

Open source wireframing tool written in typescript, react and redux.

MockFlow provides an end-to-end solution for the Product Design process making your workflow faster and efficient. Design, share, and embed work from other services with ease, while you explore MockFlow's innovative tools for all your Design needs.