From The Web
Uninstaller Tool for OS X.
Antivirus for OS X, which also detects and eliminates Windows viruses as well as Mac viruses so you don't transfer virus infected files to other people.
A somewhat simple program to enable and disable hidden OS X preferences so you can customize your computer further.
A gesture creator for OS X. You can create gestures for the Leap Motion Controller, Magic Mouse, Trackpad, Windows Mouse, and other accessories for the Mac. Definitely check this out if you are unhappy with the small amount of built in gestures for OS X
Mac App Store
A tool that purging the inactive memory on your Mac so you can keep your computer running pretty smooth when you are doing pretty RAM heavy tasks such as editing a video. Definitely download this if your Mac does not have a lot of RAM.
Basic photo editor and Collage maker.
Pixelmator, is an easy to use photo editor similar to Adobe PhotoShop. Pixelmator is very powerful because it uses advanced Mac technologies to give you a speedy experience. Touch up photos, enhance images, and even add special effects your photos with Pixelmator. Pixelmator is $30 in the Mac App Store
A tool that disables output on your keyboard so you can wipe it clean.
Allows you to download videos from a ton of different sources (YouTube, Facebook, Bing, Daily Motion, etc) to your system.
Allows you create an application from a webpage that you visit.
Helps you speed up your Mac by removing old files, cleaning up mail attachments, cleaning your trash bin and so much more in order to make more room on your hard drive.