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

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

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

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.

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.

Consulting in website usability, training and testing.

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

Provides usability consulting, research, training and conferences. Located in Massachusetts, United States.

Specializes in usability engineering, graphic design and software engineering, Located in Germany (Ludwigsburg, Dortmund, Mannheim, Munich).

Provider of user experience services utilizing usability testing, focus groups, market research, training and documentation. Located in California, Georgia, and Illinois, USA.