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Domain Samurai is a free tool, with it's primary focus being to help you find the right domain for your keywords.
It helps you:
Identify “keyword.com” domains to gain MASSIVE boosts to your traffic
Find keyword-rich domains before your competition
Unlock the power of “aged domains” to get PageRank and backlink boosts your competition can only dream of
It also includes the Keyword Research module, which can be used to find untapped keyword niches.
If you own Market Samurai, then you already have all of the features of Domain Samurai, so it's not essential to install both on your computer. The Domains module and the Keyword Research module are exactly the same in Market Samurai and Domain Samurai (an expired trial of Market Samurai has the same functionality as Domain Samurai).
You can get your FREE copy of Domain Samurai here.