Styleguide - A tool to make creating and maintaining styleguides easy
Easy User Test - Easy User Test is a user testing tool that offers the easiest way to test your text and design.
Frontify Workspace - The overall tool for creative & design collaboration: - upload, manage & share assets
Useberry - User testing feedback and rich analytics in minutes
MediaKits - The easiest way to create a media kit
Peek by UserTesting - Get a free, 5-minute video of someone using your site