SEO Book offers a set of helpful free SEO tools, focused on technical SEO and keyword research. Among them, Keyword Tool stands out as a super easy tool that gives you all you need to know about your keywords on the spot: monthly and daily search volume, CPC, monthly value and more. Keyword Tool is only accessible to logged in members, so make sure you registered a free account.

Keyword Tool is built on a custom database of nearly 30 mln of words of English language keywords.

Features:

• Rough suggested daily search volumes (Google, Bing, Yahoo!)
• Links the search volumes to the related global search results
• A broad fuzzy matching search feature takes advantage of stemming to return related word forms
• Provides links to price estimate tools from Google AdWords. Google AdWords tool shows the necessary bid to rank #1 for 85% of queries, and roughly how much traffic you could expect AdWords to send you based on that bid price and ad position
• Links to Google Trends, Google Suggest, Google Synonyms, Yahoo! Suggest, and other tools providing keyword research results
• Links to various vertical databases like Topix.net, Google Blogsearch, and Del.icio.us to let you know if people are talking about your topic and what types of resources they are referencing

Other SEO Books’ free keyword research tools:

• Generate keywords using Keyword List Generator
• Clean up your keyword lists with Keyword List Cleaner