QFitsView is a FITS file viewer similar to SAOimage, DS9, and the like. It was written using the cross-platform QT library and thus runs under Microsoft Windows as well as many flavors of UNIX and MAC OS-X.
QFitsView includes the complete DPUSER - The Next Generation application. For DPUSER, extensive documentation is available, see link below. The graphical front-end (i.e. QFitsView itself) is also documented, and should be quite intuitive to use.
Mark Durré has created a set of videos to train users in the main aspects of QFitsView. They are available as a playlist on YouTube and also the Swinburne Commons repository, including associated documents. He has also published a set of DPUSER libraries on his Github repository.For Microsoft Windows, you need this binary.
For Linux, you need this binary. Don't forget to make this executable (chmod a+x QFitsView_4.2)!
For Mac OSX, copy this disk image and copy the Application to your favorite location. You have to allow execution in the Security & Privacy - General tab of your system settings.
The combined source code of QFitsView and DPUSER is also available. I strongly recommend using the
binaries because dpuser/QFitsView are depending on lots of external libraries and is not really trivial to compile.
Please understand that I am unable to give any support for compiling.