Downie is the only video download for OS X you will ever need. It isn't simply another YouTube-downloader: Downie supports at this moment over 750 different sites! The full list may be viewed in Downie's preferences, under the Sites tab.
Keyboard Maestro is your hot-key solution that allows you to perform a multitude of tasks simply by pressing a keystroke! It also incorporates the wildly popular MacOS Classic utility Program Switcher, which allows you to launch, switch, and quit applications with a simple keystroke.
FlowVella (was Flowboard) allows you to create beautiful interactive presentations that bring your ideas to life on Mac, iPad, and the Web. FlowVella is a re-imagining of presentation software. It is simple, elegant, fast, and has been designed specifically for OS X and iOS. Presentations can be viewed by anyone, on any device!
Audio Hijack (was Audio Hijack Pro) drastically changes the way you use audio on your computer, giving you the freedom to listen to audio when you want and how you want. Record and enhance any audio with Audio Hijack - it's the cornerstone of your digital audio experience