knicklabs

They even send out an "Explore today on Gitbook" email which looks an awful lot like the "Explore today on Github" email.

It's a cool product, but they could use some original direction in their branding and marketing.

There seems to be only a few commercial packages in the Ubuntu Software Centre. As a commercial developer that probably means one of two things: (1) The market is yours for the taking or (2) There is no market.

I'd be curious to know if it is worth it as well. Have you spoke with any commercial developers directly?