Web analytics and testing tools

Omniture
Omniture is the largest global providers of Web analytics solutions, as well as other more advanced technologies like Test&Target, Omniture’s A/B & multivariate testing and behavioural targeting solution. Omniture’s online analytics products are SiteCatalyst and Discover. Omniture’s multi-channel analytics solution is Insight. They also acquired HBX Analytics from Visual Sciences.
Webtrends
Webtrends is a trusted analytics advisor in the business of collecting, analyzing, delivering and ultimately transforming data into understanding. Webtrends delivers the industry's most recognized search engine marketing, visitor intelligence, and analytics solutions to enable companies to understand their customers, drive engagement, and enhance marketing and brand awareness.
Google Analytics
Google Analytics (GA) is a free service offered by Google that generates detailed statistics about the visitors to a website. The product is targeted towards marketers rather than webmasters and technologists. Integrated with AdWords, users can optimize online campaigns by tracking landing page quality and conversions.
SpeedTrap
Speed-Trap is a provider of software that uses Web 2.0 technology to capture and deliver complete, real-time data on every individual on-line customer and prospect, based on detailed analysis of their current and historic on-line behaviour and experience – complete on-line customer insight.
Nedstat
Nedstat makes website analytics straightforward and accessible for users of all levels and disciplines. Products are easy to use, reports are clear and fast to access, customization is easy and services and support are personal and high quality.
yahoo web analytics
Yahoo! Web Analytics is an enterprise site analytics tool that provides real-time insight into visitor behaviour. With powerful and flexible tools and dashboards, Yahoo! Web Analytics helps online marketers and website designers enhance the visitor experience, increase sales and reduce marketing costs.
Coremetrics
Coremetrics Analytics provides the website analytics features you need to successfully acquire, convert, and retain high-value visitors and customers.
Test and Target
Omniture Test&Target puts control directly in the hands of marketers to quickly and continually execute multiple A/B and multivariate (MVT) tests, measure effectiveness and relevance of content across any online channel and increase content relevance through segmentation, targeting and automated personalisation.