Besides death and taxes, there is another thing that is pretty sure in life: you will have to present stuff. This is especially true in the academic world. Since the beginning of my PhD project, I was struggling to find a good tool for preparing the presentations. There were some boundary conditions: I would prefer to prepare them on my Linux computer, have the output in PDF, and make it look nice. I tried Open Office (or Libre Office), Latex and Prezi amongst other things, but about a year ago I found my true match, and that is Inkscape.