Like Ninurta, I use LibreOffice (the modern version of Open Office). As good as MS Office and free. Includes a nice drawing package.
For graphics, I also think PNG is good, but JPG is also okay for some images that don't suffer much from compression.
PDF is useful as is epub.

For graphics, I also think PNG is good, but JPG is also okay for some images that don't suffer much from compression.
PDF is useful as is epub.

Fire In The Hole