I love dc.js. In fact, I just released a data viz tool (www.machete.io) yesterday that lets lay people create charts/dashboards with dc.js. If you're a dev, you'll obviously have a lot more flexibility by crafting dcjs exactly to your liking, but machete would can help you rapidly prototype.
Example: All 3,025 Penalties in the NFL 2013 Season - http://www.machete.io/board/view/NFL_2013_Penalties/3731630c...
The plan is to use the github model - free public boards, private boards will be a small monthly fee.