Domain Checker is a desktop whois tool which can check the availability of one, a few or hundreds of domains.

Checking a single domain is easy. Type it in the Domain Name box, press Enter, click Check All, and within a moment you'll see whether it's registered or not.

Right-click that domain and you can view its details or visit the site.

The program can also generate and check 2, 3, 4 or multiple character domain names. If you're unsure what to call your software site, for instance, you could define a base address (-soft.com), generate a sequence of names (aa-soft.com, ab-soft.com...), and check them all to see which are available.

There are also tools to generate domain names by user formula, importing words from text files, and more.