Scrapping. Analyse SEO. SEO Software and SEO Tools. SEO Software. Simplified. Screaming Frog SEO Spider Tool & Crawler Software. About The Tool The Screaming Frog SEO Spider is a fast and advanced SEO site audit tool. It can be used to crawl both small and very large websites, where manually checking every page would be extremely labour intensive, and where you can easily miss a redirect, meta refresh or duplicate page issue. SEO Tools - the Ultimate Collection.
All tools listed below fall under the following criteria: they are all useful for SEOs;they are all web-based (no desk-top ones or FireFox extensions so far);they are all free.
If you know of any online SEO tools that were not mentioned here, please comment and I will update the post. I will do my best to continuously update the article to delete the tools that are no more available and add new ones. Table of Contents: Link Research Tools.