ThinkFree Office 3 Show is similar to PowerPoint 2003, producing the same .ppt format file. ThinkFree Office 3 is an amazing value and a good alternative to PowerPoint if you’re on a budget. You can create professional presentations, despite its limitations.
Keynote is Apple’s solution to producing professional-quality presentations. It’s easy to produce a simple slideshow along with music, and then enhance it with stunning visualizations and animations from Keynote’s rich feature set.