Marvel - Turn sketches, mockups and designs into web, iPhone, iOS, Android and Apple Watch app prototypes.
Userbrain - Easy, fast, and affordable user testing for websites and prototypes.
Poll the People - Poll the People is a leader in pre-live A/B testing.
UserQ - Pay as you go user testing platform in MENA
Betafi - Your User Research Sidekick
usera - Usability Testing within your app on your real users