Useful site with all sorts of design calculation ideas.
BlockLayer.com is great place to go to get all your printable diagram templates. Then have templates for everything imaginable, there's Gable Roof Framing Plans, Deck & Floor Board Spacing & Gap Calculator, Angle Calculator, Posts and Rails - Spacing and Material and so much more.
Yes, they also have Graphic Paper and printable rulers.
There are 140 different designs to pick from. Lots of good choices, and certainly a good site to bookmark for when you need designs with calculated settings.