Cost: $9.99
Keynote works through iCloud, so you'll stay up-to-date across the board. Available on whichever Apple product is your weapon of choice — iPad, iPhone or iPod — you can touch and tap your way through creating and delivering presentations, complete with slide transitions and animated or 3D charts.
Cost: FREE
"Prezi lets you bring your ideas into one space and see how they relate, helping you and your audience connect. Zoom out to see the big picture and zoom in to see details — a bit like web-based maps that have changed how we navigate through map books."