The best Whiteboard alternative to Xournal++ is Excalidraw, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Xournal++ and 11 are Whiteboards so hopefully you can find a suitable replacement. Other interesting Whiteboard alternatives to Xournal++ are OpenBoard Whiteboard, Rnote, Linwood Butterfly and Lorien.
Excalidraw is an open-source whiteboard tool that lets you easily sketch diagrams that have a hand-drawn feel to them. Available directly online as a web app and also through CodeSandbox to easily see how the code works, and the app is available for self-hosting.
Excalidraw is the most popular Self-Hosted alternative to Xournal++.
OpenBoard is a cross-platform (Linux / Windows / macOS) interactive whiteboard application. It is currently maintained by the Education Department (DIP) of the Canton of Geneva in Switzerland.
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.
Butterfly is a note-taking app where your ideas come first. You can paint, add texts, and export them easily on every device. This app works on android, windows, linux, and in the web.
Lorien is an infinite canvas drawing/note-taking app that is focused on performance, small savefiles and simplicity. It's not based on bitmap images like Krita, Gimp or Photoshop; it rather saves brush strokes as a collection of points and renders them at runtime (kind of...
Meet the freeform digital canvas where ideas, content, and people come together.
Notetaking and blackboard replacement application. Inspired by Xournal. Written in C++/Qt for Linux / Windows / Mac.
Muse is a canvas for thinking that helps you get clarity on things that matter. Think in private or collaborate with others.
A offline and online Flutter Whiteboard with collaboration Features. Maintained in my free time. Currently demo is offline.
Whiteboard allows people to collaborate on projects through its whiteboard functionality and use of real time communication. Using webRTC it allows for in-browser video conferencing and its whiteboard feature allows any participant in the call.
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Has better gui and features xoutnal++ misses like workspaces