Maze - Beautiful & actionable analytics for InVision prototypes
Responsinator - Designed to test responsive websites on different devices.
Conversion Crimes - Get insights on how users behave on your site or software and how they feel about it. Remove friction and increase motivation to buy.
Responsive Viewer - View multiple screen dimensions in one view
Koncept - Usability testing, interactive prototypes & metrics
Multi Screen Test - Test your site at different screen resolutions & devices.