Josh Parnham - Software Developer and organiser
Design Principles - An open source repository of design principles and methods
Yoink - Yoink is a website that makes it easier to drag and drop images and text from one screen to another. It's a straightforward site with help along the way if you aren't sure about dragging and how to place your content.
Atlassian Design - Design, develop, and deliver
ScreenFloat - Harness the power of screenshots to be more productive
Facebook Design Resources - A collection of free resources made by designers at Facebook