1.InstantDomainSearch.com

This tool can only check one domain name at a time but it checks .com, .net, and .org simultaneously using an Ajax type interface. This makes the searching real-time as you are typing. You can also encrypt your searches through their SSL so that you know nobody is spying on your searches.

http://instantdomainsearch.com/

2.BustaName.com

This free tool generates available domain names based off a list of words that you provide. The more words you add the more results are given. You can hyphens, suffix, prefix, and a variety of different TLD’s. This is probably the best free tool I have seen that can generate domain names for you on the web. I highly recommend this tool for all looking to purchase new domain names.

http://www.bustaname.com/

3.Domai.nr

This free web tool allows you to find creative domains using a variety of different TLD options. The tool is much like Instantdomainsearch.com in that it loads the domain availabilities as you are typing. Use this tool if you are trying to find more clever domain names that don’t usually involve the typical .com, .net, or .org.

http://domai.nr/

4.Dotomator.com

If you are in desperate need of getting creative and finding an available .com domain, this tool is right for you. It’s easy to use interface helps you combine words and think of words for you to combine. Combining a tool like this with another tool like Bustaname.com, you can very creative with your domain possibilities and find the right domain for you.

http://www.dotomator.com/

5.Domize.com

Another tool much like InstantDomainSearch.com, only you can add results for other TLD’s including .biz, .info, .us, and .mobi. Searches are done through an SSL so that your searches are private. Domize also has an iPhone app so you can search for your domains while you are away from your computer. Very nice!

http://domize.com/

6.Domainsbot.com

This tool has advanced search options that allow you to find extra ideas for domains. In the advanced options you can include hyphens, numbers, as well as a few others. What’s really cool is that you can specify the amount of keywords in the domain as well as the max domain length to prevent from seeing too long of domains. Very cool!

http://www.domainsbot.com/

7.DomainTools.com

This site has several useful tools for finding and registering new domain names. First there is a Typo Generator that is pretty self-explanatory; it generates new domain name ideas based off typos of keywords you enter. There is also a generic domain search tool that gives you a list of available domain names related to your original query. All in all, Domaintools.com is a good place to locate some new domains.

http://www.domaintools.com/