Pdf-tools: Emacs support library for PDF files
github.com
github.com
Right now I use it with Evince and SynTeX works forward (I can jump to the position in the PDF in Evince where my cursor is in Emacs) but not backward (I can't jump in Emacs to the LaTeX source corresponding to where I am in the PDF in Evince). I never managed to get it to work.
other comments may be useful to build http://www.reddit.com/r/emacs/comments/2ixp7m/pdf_tools/