Maze Templates - A library of pre-made user tests and surveys
Online Image Editor - Online editor for images and animated gifs with multiple effects and tools
Marvel - Turn sketches, mockups and designs into web, iPhone, iOS, Android and Apple Watch app prototypes.
Pixelitor - Pixelitor is a cross-platform raster graphics editor written in Java.
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!
RealWorld Photos - RealWorld Photos is an free portable photo editor for Windows.