May I suggest org-mode? It can act as a pretty good replacement for Excel, Word, PowerPoint, and even FrontPage. You can even use latex inside org-mode documents and it has an integration with gnuplot.
can you drag'n'drop images graphically and position them in a visual canvas with org mode and add sounds and gifs and videos and center text by pressing a button ? if not it's not a replacement for powerpoint.
A perfect reflection of why Linux is a failure on desktop. If org-mode and latex are sane replacements for office for average users, may the kernel gods save us all.And this is from someone who knows how to use both.
