CrowdDoc is an Eclipse plugin aiming to provide most relevant information for the currently selected code element.
The behaviour is similar to JavaDoc view, but is not limited to single language, and uses crowd-sourced documentation resources, such as StackOverflow.
The project is inspired by a work from Ninlabs Research (http://blog.ninlabs.com/2012/05/crowd-documentation/)
Eclipse p2 update site: http://crowddoc.sourceforge.net/updates