Krow
Crowman
Draw lets you build diagrams and sketches from scratch. A picture is worth a thousand words, so why not try something simple with box and line diagrams? Or else go further and easily build dynamic 3D illustrations and special effects. It's as simple or as powerful as you want it to be.
I think you can save presentations as pptx. If you mean Draw to pptx then I can't help you, I do not use it.