PDFView is a very simple program to view PDF files. on contrast to Preview, the main window will open up maximized, and with the drawer hidden by default. When you toggle the drawer, the main window will resize just enough to show it, and maximize again when you hide it. The zoom level will be as big as possible to make the document fit, making it as easy to read as possible.
Tag is a metadata editor for FLAC, Ogg Vorbis, Monkey's Audio, and WavPack files. Tag has an intuitive interface that simplifies common editing tasks while also allowing direct manipulation of tags. Tags can be dragged between files, or Tag can add all the tags contained in one file to another in one fell swoop. For files with incomplete or missing metadata, it can guess tag values by matching the filename to a user-defined pattern. It can rename files by substituting tag values into a user-defined pattern. It can edit multiple files simultaneously, eliminating repetition and saving time. It features customizable mappings that allow you to specify which tags are mapped to the various fields in the user interface.
skiTunes is a fast, extensible alternative to iTunes. It can use Apple Quicktime, VLC, MPlayer, LAME, and cdrecord. It differs from Apple's offering in that it is written in Cocoa and uses native widgets, as well as supporting formats iTunes doesn't, such as OGG and WMA. Using native widgets will allow it to automatically match the rest of the OS when a theme is applied, unlike iTunes, which requires hacking in order to make it match. It will also offer a skinnable "mini- mode".
Delicious Library is a home library system featuring creation of digital shelves for books, movies, and CDs, support for barcode scanning using an iSight or Bluetooth barcode scanner, automatic downloading of information about the scanned media from Amazon (including similar items, user reviews, etc.), the ability to track items lent to people, the ability to send recommendations about a book to friends, and much more. It features a slick, easy to use interface with high-res downloaded images of the media, making it look almost like a real live bookshelf.