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!

userthink - Get useful landing page feedback. Increase conversions.

Userbrain - Easy, fast, and affordable user testing for websites and prototypes.

Smartlook - Qualitative analytics for websites and mobile apps Start understanding the 'whys' of your users' behaviors with clear, visual insights. With session recordings and event tracking, you get the complete picture.

UserBob - Provides affordable remote user testing.

Inspectlet - Google Analytics tells you what, Inspectlet tells you why.