I don't use OS X, but.. surely you could have found these applications by searching the net.
The second result on Google was this.
http://www.object-craft.com.au/proje...pdfviewer.html
And who would have thought:
"Spanish localization." is a new feature in the latest version.
Others stuff:
http://skim-app.sourceforge.net/
http://www.adobe.com/support/downloa...osh&product=10
http://www.hexcat.com/viewit/
http://www.stalkingwolf.net/software/cocoviewx/
This was all easy to find.. it probably took you longer to post here about it.