The best alternative to Freeform is Rnote, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to Freeform and six of them are so hopefully you can find a suitable replacement. Other interesting alternatives to Freeform are MindMeister, Moqups, Explain Everything and Inko - Whiteboard.
Rnote aims to be a simple but functional note taking application for freehand drawing or annotating pictures or documents. It eventually should be able to import / export various media file formats.
MindMeister is the market-leader in online mind mapping. Unlike traditional mind mapping tools, MindMeister allows for real-time brainstorming sessions between an unlimited number of users and requires only a standard web browser.
A streamlined web app that helps you create and collaborate in real-time on wireframes, mockups, diagrams and prototypes.
Explain Everything is an easy-to-use design, screencasting, and interactive whiteboard tool that lets you annotate, animate, narrate, import, and export almost anything to and from almost anywhere.
Inko is a collaborative whiteboard that lets you draw together using multiple iPad or iPhone, and even interact on Apple TV. Ideal for team coworkers in a brainstorming session, for a creative classroom project, or for an interactive meeting between a graphic designer and their...
Drawy is a work-in-progress infinite whiteboard tool, which aims to be a native desktop alternative to the amazing web-based Excalidraw.
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Multiplatform and open source