Anima App - Design, get feedback, convert to code, publish, iterate.
SwitchResX - SwitchResX is a tool designed to manage resolutions of all your monitors and HDTVs.
Loom - Loom is a screen recording extension for Chrome that gives people the ability to create and share media. Create your own videos using your camera, screen view, and audio. Read more about Loom.
EasyRes - EasyRes is a fast screen resolution switcher for Mac OS X with live animated previews.
Marvel for Sketch - Sync, play and record prototypes in Sketch!
Resolutionator - Resolutionator makes it simple to use any of your display's available resolutions.