(Above, one of the sample projects.)
A collaboration between the Guardian and boucoup:
Miso is an open source toolkit designed to expedite the creation of high-quality interactive storytelling and data visualisation content.
Miso is a set of libraries to be released over the coming months that simplify the processes of managing data, building reusable components, and authoring narratives. Miso is in active development, and will have components released as they are completed. Follow along: @TheMisoProject & Github