Upflowy - Upflowy is a drag and drop no code tool to build and optimize web experiences.
Userbrain - Easy, fast, and affordable user testing for websites and prototypes.
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!
usera - Usability Testing within your app on your real users
Polls for WhatsApp - Create & share quick polls in your WhatsApp groups
Marvel - Turn sketches, mockups and designs into web, iPhone, iOS, Android and Apple Watch app prototypes.