Good stock of quality pictures, always like free pictures! here is a great site that offers just that. No strings attached.
Love spinning icons? Its easy with Fonitso! Like Fontawesome a great help when fast prototyping with icons is required.
Bonus design tips for designers. These are really cool tips and rules to follow if you want to start out as a designer. Even for more experienced designer!
4. Bonus bonus
Really handy when working with html5 video. I use this all the time!