Talking about Raudus, I'd be careful! You can download it for free, indeed. I was about to start using it when I realized there's no single word on its usage license. There's no license in fact, or I was unable to find it under "standard" locations (website? no. installer? no. README / LICENSE file? no.)
Thus I'd be careful with using library which doesn't specify it's license. Especially if you're about to start some project which will use it intensely - just imagine what happens when it comes out that you need to pay big amount of money for using it ...
