Usability testing as a service - Here are some interesting crowd based "usability testing as a service" solutions (source: http://www.thoughtworks.com/articles/technology-radar-october-2012#Techniques) Image credit: blog.templatemonster.com
Loop11 is a remote usability testing tool that enables you to test the user-experience of any website and identify navigational and usability issues. Test the usability of your website quickly, cost effectively and properly!
Take the guesswork out of information architecture with Treejack - the usability testing tool you can use to test your IA without visual distractions. Treejack helps you prove your site structure will work before you get into interface design.
Silverback allows anyone to perform usability testing with little or no budget. The best part is that it comes ready-to-use right out of the box. There are no configuration files or settings - it just works.