What are some companies that successfully built businesses off of desktop software for consumers?

Question by bwayne8913: What are some companies that successfully built businesses off of desktop software for consumers?
For example, Skype and Picasa pulled it off. What are some other really popular/successful desktop (i.e., not Web!) applications?

Best answer:

Answer by Manuel
if you google for open sources software ,you will see a lot of successfully ones.
m

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