OpenBoard is an open source cross-platform interactive white board application designed primarily for use in schools. It was originally forked from Open-Sankoré, which was itself based on Uniboard.
Supported platforms are Windows (10+), OS X (10.13+) and Linux (Ubuntu 20.04 is the only officially maintained platform, but many others are reported by the community to work).
Installers are available for Windows, OS X and Ubuntu on the wiki.
Building from source
Please follow instructions available on the wiki
The latest version (1.6.1) can be compiled with the latest open source binaries of Qt 5.15. While it has been shown to work with Qt 5.9 or any other version in between, we recommend that you use the latest version you can.