Apart from the Google Chrome Browser, this is the application I use the most on my Mac. OK, OK, I know that's because I take a barrel-load of screenshots each and every day, and that might not apply to all of you, but if your job involves screenshots, SnagIt is a huge timesaver that streamlines the whole process.

It also makes taking complex screenshots – where perhaps you have to use a timer or scroll down a window – a snap.

I know OS X has built-in screen capture functionality, but I find it a lot more cumbersome to use than SnagIt.

Price: $49.95

More info.