Want my opinion on the "Powered by" thing? They say "we offer this for free, so the least you can do is keep our "Powered by" logo there.
I say that's garbage. Because, while Oxwall is free.... the very same developers are making money, hand over fist, on plugins that they develop.... and they have the store, which, by design, is all about making money. So this isn't some "free" open-source project. To use this software is to make an INVESTMENT, financially. They benefit, and they know it. It keeps them and their developer buddies with a steady cash flow. So let's not try the "but we're free, keep our logo" angle, because that's crap.
I'm using Oxwall, I love it... and I pad their pockets frequently. I also removed "Powered by" and I don't feel one bit guilty, in the least, for doing so.