SEO Tools

SERP Track Tool
RankTracker
http://www.link-assistant.com/rank-tracker/

AllNo1 Google SERP Checker (multi-national)
http://www.allno1.com/google_serp/multi_country_rank_checker.asp


KeyWord Tools
Google Keyword Tool (show the data about how many times the keyword is searched)
https://adwords.google.com/select/KeywordToolExternal

Google Search-based Keyword Tool
http://www.google.com/sktool/
(You can use this tool to find out more keywords about your website. Basically it is designed for Google Adwords. However, you can use this tool for both yourself and your competitors.)


Google Trend
http://www.google.com/trends

Google Traffic Estimator (estimate how large traffic a keyword can make)
https://adwords.google.com/select/TrafficEstimatorSandbox

Key Words Density
http://www.seores.com/keywords/density.asp

Free Monitor for Google
http://www.cleverstat.com/en/google-monitor-query.htm


Page Rank Check
LinkVendor
http://www.linkvendor.com/

iWebTools (visualized page rank checker)
http://www.iwebtool.com/visual_pagerank

LinkVoodoo (Overall website score check)
http://www.linkvoodoo.com/score_site.php


SiteMap Creation Tool
http://www.xml-sitemaps.com/
http://xmlsitemap.com/


Backlink Check
http://backlinkwatch.com/index.php#
http://www.nichewatch.com/