Official Google Definition - Google Analytics is the enterprise-class web analytics solution that gives you rich insights into your website traffic and marketing effectiveness. Powerful, flexible and easy-to-use features now let you see and analyze your traffic data in an entirely new way. With Google Analytics, you're more prepared to write better-targeted ads, strengthen your marketing initiatives and create higher converting websites
Crazy Egg shows you where everyone has clicked, whether it was on a link or not – this highlights usability errors and often areas which could result in an improvement in conversions. Crazy Egg has a number of features, but there are two I like to use. The first one is the most popular feature, the heatmap. Another feature that is particularly good is confetti, this feature allows you to segment clicks according to various metrics – and for SEO the most useful is probably the clicks by keyword.
ClickTale is the industry leader of In Page Web Analytics, providing businesses with unparalleled insights into their visitors’ entire online experience. Unlike traditional web analytics that monitors visitor movement between pages, ClickTale’s web analytics solution focuses on what visitors do inside the web pages themselves.
Survey Monkey is an online easy-to-use tool for the creation of online surveys. Its primary strength is its intuitive Web interface, which makes it easy for even non-technical folks to create surveys and export collected data. It has advanced features, like the ability to branch questions based on response and exporting to different formats, including HTML, CVS and SQL.
KISS Insights (I really like this product) - Check it out
KISSinsights gives your customers a way to tell you what they need. Ask a question (or two) and your customers will see it slide up from the bottom right-hand corner of your site. It’s so quick to respond that many of your customers will!
In simple words, Ethnio lets you "Recruit people from your website for research". Personally, I liked the concept. Check it out.