SVG Backgrounds - Customize, scalable backgrounds and patterns for free
Maze Templates - A library of pre-made user tests and surveys
MagicPattern - The best design toolbox with 10+ tools for anyone
Marvel - Turn sketches, mockups and designs into web, iPhone, iOS, Android and Apple Watch app prototypes.
Patternify - The CSS pattern generator
UserTesting.com - Usability testing has never been easier. Get videos of real people speaking their thoughts as they use websites, mobile apps, prototypes and more!