ImageJ is an image processing software, very popular in the Life-Science field. If you are a master student, a PhD or a postdoc in Biology, there is a very good chance that ImageJ is installed on your computer.
ImageJ is developed mainly by Wayne Rasband, and is written in Java (see http://rsb.info.nih.gov/ij/index.html). It has a clever plugin system that allows users to extend it with new functionalities.
Fiji (Fiji is Just ImageJ, http://fiji.sc/) is a distribution of ImageJ, that includes (amongst other things) a lot of plugins, some useful libraries and an updater to keep everything up to date.
In this demo bundle, we demonstrate how to use Fiji to get a very nice, hardware accelerated, 3D viewer in MATLAB.
Note on updates on these demos files: If you have already installed Fiji and set the paths as explained in this demo introduction, you do not have to re-download them from the FEX. All you have to do is launch Fiji and run the updater. The demo files, which are part of the Fiji distribution, will be updated as well,