Backlink Checker - This cool little tool will find all the links that are pointing back to your website. Backlinks are very important when trying to get top search engine rankings. Use this tool to spy on your competition.

 Alexa Traffic Rank - This very useful tool will allow you to compare your website's Alexa traffic rankings with others. Check your traffic stats here.

 Search Engine Index Checker - This seo tool will find all the web pages indexed in search engines. Use it to find which pages got indexed and which didn't.

 Keyword Density Tool - Check density of any webpage. This is a very useful seo tool for onsite search engine optimization.

 Keyword Suggestion Tool - Cool little tool that finds relevant keywords to match your initial phrase. Check top 10 keyword phrases based on your input.

 Link Popularity Tool - Finds how many total backlinks a website has on any specific search engine. Very useful when monitoring progress of your link building campaign.

 Page Rank Tool - Simple tool that checks your website's Google Page Rank. Page Rank is Google's measure of importance.

 Google Page Rank Prediction Tool - You can use this tool to predict your future Google Page Rank.