OpenBoard alternatives
Programs you can use instead of OpenBoard. Free and open-source options come first; every download is from the publisher's official source.
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Xournal++
Xournal++ is an open-source note-taking application designed for handwritten notes, sketching, and annotating PDF documents.
Shared platforms: Windows, Linux
WindowsLinux
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Rnote
Rnote is an open-source program for handwritten notes and sketching.
Shared platforms: Windows
Windows
Other alternatives not on the site yet: Microsoft Whiteboard