I remember that I used a program for viewing JUnit XML reports two years ago, but I forgot their name and can't google it.
Could you recommend me a simple standalone app (i.e. not IDE) for viewing JUnit XML reports?
I got super annoyed with this too so I build a tool myself
I wanted the same thing for YEARS, I finally found the time to make what I needed and it can be found here: https://github.com/inorton/junit2html
It generates full a full detailed single HTML page that contains all of the test results and captured content with a reasonably easy to browse index.
Alternatively, if you really want to stick with the [limitations] XML reports, you can write a XML stylesheet (aka XSLT), that you can merge with your XML reports to produce almost any output. A quick Google around shows that this has been attempted before;
If you want to write you own;
All of the above are FOSS software.