Basically it's from the Modern Path -
http://www.d20modernpf.com/introduction
But, it has a lot of added material, converted to work within it's system. It has a lot of the MSRD material included as well as some other OGL modern material from other 3pp.
Just an FYI - I am no longer working on it, (or anything else) and turned over all the files to Community some time ago. The Modern Path was pick up by another 3pp and they are currently working on Modern Path 3.