My top 5 favorite user testing tools for lean startups

With these 5 tools you can build measure learn fast and affordable for your lean startup:

1. Optimizely:  simple setup online A/B testing suite with great UI and reporting
2. fivesecondtest:  ad hoc online test with real users of mockups, creatives, landing pages etc.; also great to test your competitor´s logos, sites, f
3. usertesting: ad hoc online test with real users, to whom you can give specific tasks; also cool for testing of mobile apps; you can select the profiles of testers (gender, age, interests etc.)
4. surveymonkey:  ecxellent and easy to setup survey generator with options to send out by mail and built in analysis tools
5. crazyegg: cool heatmap tool that shows you, what your visitors have seen on your page by tracking their mouse movements and clicks; it shows you also how deep they scrolled; you can filter by traffic source to see if eg. paid (branded) traffic behaves differently than SEO or organic visitors

Also quite good: www.abtests.com   
Get inspired by what other product managers A/B tested and share your own tests, too.