utopia-documents 2.4.4-2 (ppc64el binary) in ubuntu vivid

 Utopia Documents is a free PDF reader that connects the static
 content of scientific articles to the dynamic world of online
 content. It makes it easy to explore an article's content and claims,
 and investigate other recent articles that discuss the same or
 similar topics.
 .
 Get immediate access to an article's metadata and browse the
 relationship it has with the world at large. Generate a formatted
 citation for use in your own work, follow bibliographic links to
 cited articles, or get a document's related data at the click of a
 button.
 .
 Various extensions provide links to blogs, online data sources and to
 social media sites so you can see what other researchers have been
 saying about not only the article you're reading but its subject
 matter too.