2. Flyspray. If you use Bugzilla, much fun trying to integrate the Perl-bugzilla-scripts with your PHP site ... it just won't fit.
3. Ewiki. Integrates the Wiki into your site with a simple call to <?php print(ewiki_page()); ?> instead of expecting you to force-fit your site into the Wiki.
What's the point in all this integration, really? To have fancy menus all the same everywhere?
I think products here should be chosen by their functional and usability characteristics, not just because they are written on that particular language or use some particular framework. While the latter is nice, it is very frustrating to get a nice integrated site useful for nothing in all its integrity.
I would rather not have written all this, but unfortunately I already had the experience of the integrated nothingness in my life. It involved two mistakes from my side: first, choosing intergrity over functionality, and second, judging by the first look. At first, it looked nice. Unfortunately, it end up smelling bad. That is why these days I suggest bugzilla, as a tool of success many great projects use, and mediawiki, which was based on some real demands and evolved to be a really powerful and handy engine judjing by the wikipedia todays success and fragrance. I also have my own personal experience with both tools -- and I like using them just myself, too.
But these are only suggestions, I would never insist on anything here. The only thing I would
really recommend for Laze is to ponder everything carefully before making final decisions. If you want trying mantis -- good, go for it, but finding real facts about use of it in real life would be crucial. A quick google glance was full of 'wow, this looks cool, installing was a snap, tried filing one bug so far and it worked, how nice', but not much of 'I have been using it for year and now I got something to say'. In fact, no, I found one, someone said he end up having patching something in it and migrating to another BT. Oh well.
Make up your own opinions and findings, try using it yourself and so on -- but just don't make fast decisions. That is all I ask, really. Judjing from the first look is dangerous -- just a personal experience I wanted to share.