SEO Tools

Google Analytics
Free SEO tool from Google. Tells you everything you want to know about how your visitors found you and how they interact with your site. Tells you which keywords perform.

Google Trends
Tells you what is searched for over time, and allows you to find seasonal trends to plan SEO campaigns around.

Exploding Topics
Surfaces rapidly growing topics early.

Google PageSpeed Insights Tool

Bing Webmaster Tools

SEMRush
A keyword research tool for search marketing professionals.

Ahrefs
Track your backlinks, keywords and brand mentions, and know what your competitors are doing.

Open Site Explorer from MOZ
Research backlinks, find link-building opportunities and discover potentially damaging links.

SEO Tools at Digital Point
http://www.digitalpoint.com/tools/
Great site for SEO Tools and search engine optimisation in general.

SEO Tools from SEO Chat
http://www.seochat.com/seo-tools/

Seo Tools from SEO Company
http://www.seocompany.ca/tool/seo-tools.html

SEO Book Tools
http://tools.seobook.com/

SEO Book Keyword Suggestion Tool
http://tools.seobook.com/general/keyword/
Gives loads of useful SEO data such as Overture data, Google Trends, bid prices, all in one go.

NicheBOT
http://www.nichebot.com/
Free SEO tool to help with keyword discovery and keyword targetting.

Domain Stats Tool
http://www.webconfs.com/domain-stats.php
SEO tool that gives stats for the number of pages indexed for your domain name in Google, Yahoo! and MSN.

SEOmoz SEO Tools
http://www.seomoz.org/tools.php
SEO Tools from SEOmoz. When we last visited we found SEO tools for Keyword Difficulty, Page Strength, IP Location Lookup, Sandbox Detection and Rank Check.

We Build Pages Cool SEO Tool
http://www.webuildpages.com/cool-seo-tool/
Gives a selection of useful SEO data including rank in popular search engines, number of backlinks and age of domain.

urltrends Link Popularity Tool
http://www.urltrends.com/
Tells you how many backlinks your site has.

Link Hounds Link Harvester
http://www.linkhounds.com/link-harvester/
Offers in-depth link analysis.

webceo
http://www.webceo.com/
Comprehensive SEO software package available for purchase.

Niche Watch
http://www.nichewatch.com/
Gives various stats for websites ranking for a given keyword, e.g. the number of backlinks to the domain in Yahoo! and the keyword/keyphrase occurrences on the given web page.

SEO Quake for Firefox
Allows you to quickly see key SEO data such as domain backlinks, page backlinks, the age of the site etc.

SEO for Firefox
Tool from Aaron Wall giving key SEO data.

SEO Link Analysis FIrefox Extension
Displays the PageRank and anchor text of each link when you perform a backlink check.

SearchStatus Firefox Extension
Gives you comprehensive SEO data.

webconfs
SEO tools.

Majestic SEO
For backlink information.

SEO SpyGlass
For backlink information.