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 (7+), OS X (10.9+) and Linux (tested on Ubuntu 16.04).
Installers are available for Windows, OS X and Ubuntu on the wiki.
First, obtain the third party libraries from the OpenBoard-ThirdParty repository, and build them (instructions are provided for each library).
Then, you may use the build (and packaging) scripts which are provided for all three platforms. These take care of compiling OpenBoard, including the translations (for OpenBoard and for Qt), stripping the debug symbols, creating the installers etc. Minor modification to those scripts may be necessary depending on your configuration, to set the correct Qt path for example.
Alternatively, you can easily build OpenBoard with qmake and make:
qmake OpenBoard.pro -spec linux-g++-64 # replace linux-g++-64 by macx or win32 for other platforms
make
Compilers used are gcc (Linux), clang (OS X) and MSVC 2010 (Windows). Make sure that your version of Qt matches this, as it is not possible e.g to build OpenBoard with clang if Qt was built with gcc.
The latest version (1.5) requires Qt 5.5. (While it has been shown to mostly work with Qt 5.2, we cannot guarantee compatibility with Qt versions other than 5.5.)
Due to a shared library conflict within Qt 5 in some distributions / some Qt versions (the Multimedia and Webkit modules were built against different versions of gstreamer by default), a specific installation of Qt5.5 may be needed for all of OpenBoard's features to work correctly.
It can either be built from source, with the configure flag -gstreamer 1.0 (see here), or installed from Stephan Binner's PPAs on Ubuntu.
In the latter case, simply add the repositories and install Qt 5.5.1 like so (example provided for Ubuntu 14.04, aka "Trusty"):
sudo add-apt-repository ppa:beineri/opt-qt551-trusty
sudo apt-get update
sudo apt-get install qt-latest
Some distributions, such as Ubuntu 16.04, provide Qt 5.5.1 packages that work perfectly with OpenBoard, so you can simply install Qt from the official repository.