Darn... this can't be true!
NetBeans IDE is one of the most popular IDE's, probably used by the Java community, mainly.
There are tons of plugins and it has an intuitive GUI - IMO. (Better than Eclipse IDE.)
Who hasn't used tar yet? On a daily basis, this tool is indispensable.
Once you know the main arguments to this command, it's an intelligent tool for daily administration tasks, like backup, installations, data transfer, or whatever you can think of that one needs an archiver for.
Available and established on pretty much any platform.
XWiki is a very mighty and extensible wiki software. Based on Java/JSPs and container-capable (like Tomcat 6) this wiki was made for Java people!
Just read about all its features on XWiki's web page. I mainly use this wiki as a collaborative / intranet software, that can be easily extended f.ex. by groovy scripting.
All I can say that I get along well with it, and I have used and tested a number of different wikis before. I have tested XWiki maybe one or two years earlier, and by then it was way too slow and clumsy, but now it's fine and fast.
MediaWiki might be more straightforward, but not as flexible. Bitweaver wiki is small and easy to handle, but not very ergonomic to some respect, let alone extendable.
So XWiki seems to be a good choice.