User interface design and usability evaluation consultancy. Located in London, United Kingdom.

Consulting in website usability, training and testing.

Usability & user experience consultancy based in Switzerland, providing services such as user testing, user research, user interface redesign, eye tracking for software, web and digital technologies.

Provides web site design and evaluation services for small and mid-sized businesses. Focus on usability, customer-focused content and clean design. Based in Renton, Washington, United States.

Consulting firm offering Web optimization services and information. Located in Michigan, USA.

Offers service for designing online-help system, user documentation and translation. Located in Oslo, Norway.

Offers usability testing, UI design and customer research services. Located in Washington, USA.