Probably the best free generator is Good Keywords. The software has a solid number of features and is freeware!
There are a number of commercial mistype tools: Probably the most useful mistype tool, is once again a tool used primarily for domain mistypes, and for that there is no better tool than
sTypo generates mistyped domain names and scans them through Overture™ Search Term Suggestion Tool for typein as well as availability and parking information. With full support for multiple proxy servers, fast scan speeds and integrated sponsor checking, sTypo is the tool of choice for domain investors and web site owners alike." - sType.com
and off course the best all round SEO tool available: Web CEO
Web CEO has probably the best overall set of tools for search engine optimization around, and considering something like 130,000 people are using there software, you know your in the right hands.
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