This is some java code which reads NeXus files into ImageJ. It uses the Java-hdf interface to HDF5. It tries to do a good job locating the image dataset by NeXus conventions. But it uses the old style conventions.
Hmmm... This list is similar to, yet different from, the listing in the utilities section of the manual. Enough that I will put all this content into the utilities page with a link from the Examples page.