Abacus Web Usability
- Consultants to help you improve the user friendliness of your web site, located in Florida, USA.
- http://www.abacuswebservices.com/

Clickdensity
- Offers a tool to record the position of every click on a web page, creating a virtual heat map of visitor activity. Includes details of benefits and how it works, together with a free demonstration.
- http://www.clickdensity.com/

Incontext Enterprises
- Provides design, training, and market information services. Located in Massachusetts, USA.
- http://incontextdesign.com

Serco Usability Services
- London, UK based independent usability consultants, covering websites, interactive TV, interactive appliances and mobile Internet devices.
- http://www.serco.com/usability/

ePerformance Consulting
- Consulting services covering usability, information architecture, user experience design, search engine optimisation and complete website design. Located in the UK.
- http://www.eperformance.co.uk/

Dreamstep Design
- User Centered approach to interface analysis and design.
- http://kevinbury.com

Centralis
- A user experience consultancy offering research, testing and design expertise to develop interactive applications. Located in Illinois, USA.
- http://www.centralis.com

Foolproof Business Services
- Examining the online sales process from the customer's point of view. Located in England.
- http://www.foolproof.co.uk

Experience by Design
- Washington, DC based information architecture and user experience consultancy for websites & software.
- http://www.experiencebydesign.com

Usablity Glossary
- Boston Web firm offering information architecture, interaction design, usability consulting, and copywriting.
- http://www.bobgoodman.net/main/glossary.html

KeyLabs Software Testing Products and Services
- KeyLabs is an independent testing lab providing web site application performance testing.
- http://www.keylabs.com

Idean Research
- Offering user experience research services and consultation in usability for the products of the digital world, especially wireless ones. Located in Finland.
- http://www.ideanresearch.com/

Design Interpretive
- Integrated delivery of user interface design, industrial design, and usability assessment and testing services. Located in Ottawa, Canada.
- http://www.designinterpretive.com/

Erik More
- User experience consulting services focused on usability engineering, information architecture, and interface design. Located in California.
- http://www.erikmore.com

Cox & Hall Interaction Design
- Texas design consultantancy specializing in user interface and interaction design, visual communication, and usability for products requiring human-computer interaction.
- http://www.coxhall.com

gotomedia, inc. - interaction design and usability consulting
- Offers customized user experience and branding solutions. Notable clients include Macromedia & WebEx.
- http://www.gotomedia.com

Effortmark Ltd.
- Usability Consulting firm based in Leighton Buzzard, UK. Focuses include making web sites and particularly web forms easier to use.
- http://www.effortmark.co.uk

Usability by Design Ltd
- Offering usability and design consultancy to the e-commerce and client server markets in Europe. Located in London, United Kingdom.
- http://www.usability.uk.com/

fhios
- Offers user research and services for the complete design and development process including usability testing. Based in London, United Kingdom.
- http://www.fhios.com

flyTrap Interactive
- Offers user interface design services at all phases of application development, including working prototypes for web and interactive multimedia applications. Based in San Diego, California, United States.
- http://flytrapinteractive.com/

Sliced Bread Interaction Design
- User interface design consultancy creating online, desktop, and handheld products and services. California, United States.
- http://www.slicedbreaddesign.com/

Jeff Brace Design
- Consulting services include business analysis, information architecture, user interface design, and usability evaluations. Located in British Columbia, Canada.
- http://members.shaw.ca/jeff.brace/

Interaction Architect
- Sim D'Hertefelt offers services for designing usable interactive systems, includes articles. Located in Belgium.
- http://users.skynet.be/fa250900/

Experience Research - Richard Linington
- Ethnographic research leading to the creation of useful and desirable user experiences. Located in the United Kingdom.
- http://www.experienceresearch.com/

Fields, Jason: air-port
- Evolving technology and delivering a more compelling and dynamic digital experience to end users online and offline. Based in California, USA.
- http://www.air-port.com/

Membex
- Specializing in interface design, usability testing, site development, database architecture, and ecommerce sites. Located in Pennsylvania, USA.
- http://www.membex.com/

Pamam
- Solutions for user interface design and human factors engineering. Located in Israel.
- http://www.pamam.com/

Usable Interface
- The portfolio and resume of Kyle Pero, a usability analyst, interaction designer, and information architect consultant based in Pennsylvania, USA.
- http://www.usableinterface.com

Vista Point Consulting
- 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.
- http://www.newvistapoint.com/

Information & Design
- Offers usability consulting. Includes resources, articles and courses. Located in Melbourne, Australia.
- http://www.infodesign.com.au/

Web Site Optimization, LLC
- Consulting firm offering Web optimization services and information. Located in Michigan, USA.
- http://www.websiteoptimization.com

Evan Media
- Creation of user-centered interface designs, websites and custom web applications for small to mid-size businesses. Located in California, USA.
- http://www.evanmedia.com/

Shiro Wilde
- Interaction Designer
- http://www.freshgoods.com/projects/

Andrew Fox Interactive
- Design, usability and consultancy. Located in the United Kingdom.
- http://www.andrewfox.co.uk/

Nat Bobbitt's Laboratories
- Research and IT consulting expertise in the assessment of information systems for: ERP, CRM, CMS, DBMS. Located in Colorado, USA.
- http://www.nabslab.com/

Quakenbush Design
- Interface Design consultation for browser-based and traditional software as well as interactiveTV.
- http://www.q-design.com/

Reynolds, Louis
- Information architect and GUI consultant, specializing in information architecture, user testing, user experience, and GUI design. Located in New Jersey, USA.
- http://www.louisreynolds.com/

Aptima, Inc.
- Providing innovative research and applied design for government, industry, medical, and transportation fields. Locations in Washington DC and Massachusetts, USA.
- http://www.aptima.com/

The Communication Studio LLC
- Seasoned interaction designer: documentation, graphics, wireframe models, best practices & information architecture. A unique combination of business understanding, technical acumen, creative talent and strategic insight. Experienced in transactional
- http://www.jcvtcs.com/index.html

Acernus
- Provides usability services as well as site design and site creation services for web based companies.
- http://www.acernus.com

Eleven Consulting
- Helps companies determine product strengths and weaknesses, and gives specific, blueprint-level guidance on how they can be improved. Located in California, USA.
- http://www.elevenconsulting.com/

Reuten
- Offering information architecture, user experience and usability evaluation services. Located in Melbourne, Australia.
- http://www.reuten.com.au/