A consequence of looking at how to improve website SEO and having the credits from the Amazon Startups Founders program is that The Crawl Tool has an aspect of research on the link graph. Most of that really only has benefits in the longer term, but occasionally some quicker, useful things come to mind.

Web directories have fallen in popularity, but can still be a good way to start out and get direct traffic, particularly if they're niche or topic specific.

Here is a list of 26244 domains that are linked to by somewhere on the internet that have the word "directory" in them. These are then sorted in order of the Domain Pagerank, so that the most important ones show earlier on the list.

You can filter the list by typing text into the search box and clicking Search. To go back to the original list, simply clear the search box and click Search. This can help you narrow the list down to a particular topic or tld.