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.
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.