Based on Google search results of course, this Google tool shows you relevant keyword ideas and their Adwords competition for your website.   Related posts: Get New Keyword Ideas Stats On PPC Ads Monthly Keyword Search Volume

A basic tool to see how difficult it will be to rank high for a given keyword or keyword phrase in the SERPs. SEOchat doesn’t give specific info about how they arrive at the result (anything else besides number of searches and SERPs?), but a few test searches turned out

This tool at SEOworkerss gives you an overview of basic aspects of your page, like meta tags; keyword density; page load time; title meta tag relevancy to page content; robots.txt file and more.   Related posts: Free SEO Analysis Tool Meta Tag & Keyword Analyzer How Hard Is It To

Are the right keywords prominent on your page? Find out with the keyword analyzer at Ranks.nl. It also lets you compare the results to your competition and shows meta, outgoing links and more.   Related posts: Keyword Density Checker Meta Tag & Keyword Analyzer Get New Keyword Ideas

Spacky picks up searches from Google, Yahoo and MSN and displays them side-by-side. Works pretty well, but doesn’t pick up lower search volume keywords and phrases.   Related posts: Keyword Trends Google Keyword Search Tool Keyword Suggestions Tool

Find search volume of keywords and related keyword phrases with Wordtracker’s free keyword suggestion tool.     Related posts: Finding Keyword From Questions Keyword Suggestions For Your Website Monthly Keyword Search Volume

Try another good free keyword suggestion tool at KeywordDiscovery. KEI analysis, seasonal trends and other features are available on the paid version.     Related posts: Finding Keyword From Questions Show Related Posts in WordPress Keyword Suggestions For Your Website