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Impressive is a program that displays presentation slides. But unlike Impress or other similar applications, it does so with style. Smooth alpha-blended slide transitions are provided for the sake of eye candy, but in addition to this, Impressive offers some unique tools that are really useful for presentations. Its not as flashy or feature-loaded as the usual presentation software but what I like about it is its simplicity and the potential to do more (it is after all a FOSS app), its just a 150k python script (fully configurable and free) that allows you to render your PDF files as presentation, providing hardware-accelerated effects (page transitions), a smashing overview screen that looks like Compiz or Cooliris, a highlight box that stays that way until you disable it and the cool spotlight effect (so you can throw away that laser pointer). Of course its not as complete as Keynote,Powerpoint
or Impress but in some ways I find it more impressive :)