Uhm...
Long version: the names of the files in that list answers your question about which one to download because 1) you know the kind of processor in your box, 2) you know which OS your box is running, 3) you know which distribution of that OS it is, 4) you know about the package management system that distribution uses, and 5) you don't see any such package in the file list.
Short version: get the source. Detailed instructions on configuration/compilation/installation are most likely to be included.
I'm not at all familiar with Jikes, so I took a brief look at the homepage (I suppose
this is it), and it seems Jikes is not an IDE. It's a compiler. Do you really need it? Why can't you use Sun's SDK (which as you know is included in Slack 9.1)?