PostView is a Mac OS X Viewer for PDF, Postscript and image files. It opens Postscript files quickly without first converting the entire file to PDF and provides a variety of features for comfortable on-screen viewing.
it is easy to use and also has a friendly interface.
Visualize files in RAW format generated by Sony cameras.
View and convert PDF files.
EasyCloud Reader allows one to quickly view files they have stored in iCloud.
Is a Macintosh application that allows the user to view and translate STL files.
This app can control whether Acrobat will be used to view PDFs in a browser.
DNL Reader will allow you to view eBooks in the .DNL format.