Apple does bring the best out of lots of things but since I’m a guy who doesn’t want to bore people up with long descriptions etc, I’ll skip that. Bottom line, have gathered a great list of softwares for Mac (design) users, most of these are free, some offer trial periods and vice versa. I hope you’ll enjoy and find something that can be helpful to you in any manners.
1- Just Looking (Photo Viewer) – Free

JustLooking, an image viewing program for Mac OS X. JustLooking is designed to be used instead of the “Preview” application on your computer for browsing most image file formats. In particular, it has the following differences:
It focuses on files and directories instead of lists of files. Thus, once you load a file, you can easily navigate through all other files in the same directory.
It displays images at their native resolution instead of interpreting DPI information stored in the image meta-data. While images are printed at the maximum resolution possible, on screen they are displayed pixel-by-pixel.
Being designed more for viewing of Images, it properly shows animated GIF files.
The entire program can easily be manipulated and powered by simple keystrokes for a quick and pleasant viewing experience.
There is support for printing, image resizing, saving to a few key image formats, and displaying of all image info.
JustLooking is an free image viewing program for Mac OS X which is designed to be used instead of the “Preview” application on your computer for browsing most image file formats. It focuses on files and directories instead of lists of files. All you have to do is, load a file and you can easily navigate through all other files in the same directory. It displays images at their native resolution instead of interpreting DPI information stored in the image meta-data. While images are printed at the maximum resolution possible, on screen they are displayed pixel-by-pixel. Being designed more for viewing of Images, it properly shows animated GIF files. The entire program can easily be manipulated and powered by simple keystrokes for a quick and pleasant viewing experience. There is support for printing, image resizing, saving to a few key image formats, and displaying of all image info.
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There are a lot of good screen capturing applications out there for Mac, most of them are paid, some are shareware and there are free ones too. Here is a list of some great freeware softwares for capturing screenshots of your MAC.
1- GrabberRaster

GrabberRaster is a great application that gives you access to take repeated screenshots and can capture from almost anything on your MAC. You can resize and save anything you like in a single click.
Download GrabberRaster
2- Copernicus

Copernicus is a smashing application for Mac that not only takes screenshots of as many pictures you want to but also gives you access to create shorter movies out of those pictures by increasing the movie framerates significantly.
Download Copernicus
3- InstantShot!

InstantShot! gives you a classical screenshot functionality for capturing the whole screen, a portion of it or a window. Some cool features include, taking timed screenshots where you can set a timer, take multiple screenshots at once and lots more.
Download InstantShot!
4- SnapNDrag

SnapNDrag is a simple, free application for your Mac that makes the screen capturing job easier. With a single click of a button, you can capture and then drag the result off to another application or to the Finder.
Download SnapNDrag
5- ScreenCaptureX

ScreenCaptureX is another free software for capturing a section of your screen or a full window. It saves those images as JPEG (By default) which you can change to either PNG or PICT. It also gives you the ability to add a caption to it.
Download ScreenCaptureX
I hope you like these and if there’s any missing that you think should be added, please leave it your comments, I’ll surely update them.