GNUnet
secure.wikimedia.org
secure.wikimedia.org
If GNUnet is like other file sharing, you share files while you are online, responding to searches and transferring files that are requested.
Short and giving a clue as to function and freedom the name seems a good choice to me. The (GNU) GPL insures that the users and community will not be restricted from making their own fixes or enhancements. I think it is misleading when some refer to a permissive license as restrictive. You're given permission to do practically anything to the code for your own use, and basically have permission to distribute it to others too as long as you DON'T impose new restrictions on them.
Nope, GPL variants are still the most popular licenses: http://www.blackducksoftware.com/oss/licenses#top20
Chromium, Rails, Ruby, Python, PHP, Riak, jQuery, SproutCore, basically everything from Apache and Mozilla including Firefox and CouchDB, etc.
There are exceptions like MySQL and MongoDB but they are exactly that, exceptions. Some of them are big ones such as Linux distros, I'm not saying there isn't a lot of existing GPL software out there today. I'd like to see license stats from BitBucket, Google Code, and Github.
I haven't noticed any particular recent changes away from the GPL; for example, all of the major DVCS tools (Bazaar, Darcs, Git, Mercurial) use the GPL.
For what it's worth, I prefer to avoid non-GPL software. jQuery and Firefox are at least dual-licensed, so I don't mind using them, but I prefer to avoid Chromium (and especially Chrome) unless necessary.
The right way to do things is not a popularity contest. Nor should it ever be. Nor should you put pressure on someone trying to do right via an appeal to popularity.
I'd trust GNUnet over Freenet, simply because I 'know' the organisation behind it.
Bad enough that the less ugly style of URL has the unnecessary /wiki/ in it.