"Scalar is a free, open source authoring and publishing platform that’s designed to make it easy for authors to write long-form, born-digital scholarship online. Scalar enables users to assemble media from multiple sources and juxtapose them with their own writing in a variety of ways, with minimal technical expertise required.
More fundamentally, Scalar is a semantic web authoring tool that brings a considered balance between standardization and structural flexibility to all kinds of material. It includes a built-in reading interface as well as an API that enables Scalar content to be used to drive custom-designed applications. If you’re dealing with small to moderate amounts of structured content and need a lightweight platform that encourages improvisation with your data model, Scalar may be the right solution for you."
- from source: http://scalar.usc.edu/scalar/