- DomainBoardroom – Private forum with great signal to noise ratio.
- NamePros – Free forum that is a great place to learn the ropes.
- DNForum – Paid forum that is useful for selling domains.
- KeywordDiscovery – Search frequency from over 200 search engines.
- WordTracker – Search frequency from Dogpile and Metacrawler.
- Google Keyword Tool – Shows frequency and ad competition.
- Adwords Traffic Estimator – Shows avg/max CPC and estimated clicks for keywords.
- Overture – Search frequency from Yahoo as of January 2007.
- SpyFu – Shows how much advertisers are paying for keywords.
- NameBio – Powerful way to search through past domain sales.
- DNJournal – Recaps the top sales from the previous week.
- EstiBot – Evaluates a domain based on 30+ metrics.
- dnScoop – Not quite as sophisticated, but still useful.