Crazy Egg

“Visualize your visitors.” Crazy egg lets you supplement your analytics data with stunning visuals. Site overlays and heatmaps show you exactly where your customers click… and where they don’t.

Google Trends

Google Trends is a new tool from the Google Labs. You enter a term or series of terms that you want to check the trends for and simply click the “Search Trends” button. Google will show you a graph that represents search volume for that term as well as plotting news stories on the graph that may help explain sudden spikes or dips in traffic.

Wordtracker

When researching keywords, Wordtracker is very useful for finding terms similar to the ones you input. It also shows you how many searches were made for that term in the last 90 days. Wordtracker obtains its data from the Dogpile and Metacrawler searches as well as providing the option to show data from Overture.

Google Analytics

Gain valuable insights into where your visitors come from, what they do on your site, and how you can more effectively turn them into customers. Incredibly, this powerful tool is absolutely FREE.

Marketleap Link Popularity Checker

Using the Link Popularity Checker you can compare your link popularity to the link popularity of other websites within your industry, as well as specifying competitor URLs to check against your own.

Google Datacenter Watch Tool

This tool allows you to send a search query to multiple Google datacenters. With this information you can see where a website ranks across the different datacenters before they propagate to primary result datacenters.

Keyword Discovery

Boasting an unparalleled number of unique search terms – plus great features like Phonetic Matching, Seasonal Search Trends and Keyword Density Analysis – Keyword Discovery is the next generation of keyword research tools. Free demo.

TouchGraph GoogleBrowser

The GoogleBrowser queries Google for “related:” results of a specified URL. It then takes that data and plots the information in a graph that resembles a roadmap. It is a great way to get a visual idea of what websites Google considers “related” to other websites.

Digital Point Keyword Tracker

This tool is used to track keywords for various websites. It requires a Google API key to query Google results. You can also view a graph that tracks the results of your keyword checks.

Xenu’s Link Sleuth

Xenu’s Link Sleuth is best used to spider a website and identifies broken links and redirects. It can also be used to create a basic sitemap of your website.

Sitemap Generator by Audit My PC

A highly recommended webmaster tool. Quickly and easily generates Google, HTML and XML sitemaps. Free, with no limitations.

SOFTplus GSiteCrawler

The GSiteCrawler is an excellent tool that crawls a website as well as checking Google to create a list of pages within the website. Once the crawl is complete you can change the priority and frequency of each page crawled and use this data to generate a Google Sitemap.

Quantcast

Quantcast is the world’s first open internet ratings service. Advertisers can find reports on the audiences of millions of web sites. Publishers can ensure their sites are represented accurately by tagging them for direct measurement. The service is free to everyone.

Google Website Optimizer

Wondering whether some changes might improve your website’s performance? Don’t guess; find out for sure. Another incredible FREE tool from Google, Website Optimizer lets you run your own A/B and Multivariate tests on your website.

Compete

Compete.com provides free web statistics on every site on the Internet. Using “click sharing”, compete.com shows you how safe, popular and valuable a site is. It also lets you see how your traffic compares to your competitors, which search terms are driving traffic to their sites, and much more.

Microsoft adLabs

An amazing array of free tools including Demographics Prediction, Content Categorization, AdText Writer, Keyword Forecasting and much more. All tools are demos or prototypes, with no guarantee of accurate data. But it’s a great place to go for ideas.

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Many thanks for the teaser by Zhukov Alexandre