Preview is a simple and elegant application by Apple for viewing and working with images and PDF documents. With a single click, Preview takes your PDF document full screen for an ideal reading or viewing experience. Quickly select text or images and copy and paste them into other applications. Move individual pages around or delete pages altogether, and combine documents with a drag and drop. Easy-to-use annotation tools let you add markup or editorial comments for sharing with others. You can als... More info »
For basic cropping and whatnot, Preview is a surprisingly capable image editor. At least, it makes MS Paint look embarrassing.
Preview is one of the best things about OS X. Every OS needs a decent PDF reader and image viewer (not necessarily together), and this is better than all of the alternatives. If only Windows had an equivalent...
