Free online software to track SEO indications over time. Provides current and historical views in a clear graphical interface. SEO indications that are tracked by the software include: back links, SERP in Google and Yahoo, main referral links analysis, page rank of chosen URLs, number of indexed pages in Google and Yahoo, keyword density.

Free SEO analysis tool that offers on-page keyword analysis and site-by-site competitor comparison for both SEO experts and SEO beginners.

DNSstuff is a web application that empowers users with tools and expertise to test, resolve and configure their DNS and network.

SpyWords is a SEO tracking tool. It provides precious information on crawlers, search engines, your keywords and pages.

Search engine optimization software tools for website submission, keyword research, link popularity building and search engine ranking.

SEO Trail is a search engine tracking tool and a social networking tracking roll-up that monitors how well a site is performing across various indexing and ranking platforms.

CleverStat offers SEO and web ranking software solutions, both free and free-to-try, including web ranking, website content analysis, backlinks checking solutions.