I think I posted this somewhere else, but.... who cares, one more topic, one more post. 
I installed some more or less random scripts for testing purposes, if you want to give any of them a try, feel free:
http://testing.elkarte.it/elk/ (of course :P though I should move it to the dev branch to make it worth having)
http://testing.elkarte.it/wedge/
http://testing.elkarte.it/testing/mybb16/
http://testing.elkarte.it/testing/phpbb31/
http://testing.elkarte.it/smf21/ (I think it's outdated as well)
http://testing.elkarte.it/smf20/
http://testing.elkarte.it/wbb41/ (beta 1, I'm trying to upgrade to beta 3)
If you want to try them out feel free to. 
About WBB: I didn't find any restriction on usage, so I suppose it's fine to have it up on a public server. Of course as soon as the beta is expired it will go. If you know of any restriction on using the beta versions, let me know ASAP, thanks!
Modern, Free, Powerful