4. ClearSlide
Much more than a presentations app, ClearSlide is a comprehensive sales and marketing platform that includes advanced content management and analytics tools and the ability to build live presentations and email campaigns.
For presentations it offers the rich features of SlideRocket, which is being merged with ClearSlide and which enables you to create strong, distinctive slideshows. ClearSlide is a sophisticated tool with pricing to match, starting at US$35 per month.