Global File System, was originally GPL'd, then made proprietary in 2001(?), but in 2004 was re-GPL'd.
SAP DB, which has become MaxDB, and is now distributed (and owned) by MySQL AB
InterBase database, which was open sourced by Borland in 2000 and presently exists as a commercial product and an open-source fork (Firebird)
Doom, which now has several source ports such as Doom Legacy and lsdldoom
Before changing the license of software, distributors usually audit the source code for third party licensed code which they would have to remove or obtain permission for its relicense. Backdoors and other malware should also be removed as they may easily be discovered after release of the code.
Ironically, though opensource and blogs are done for free, those worlds resemble market economies, while most companies, for all their talk about the value of free markets, are run internally like communist states.
So these, I think, are the three big lessons opensource and blogging have to teach business: (1) that people work harder on stuff they like, (2) that the standard office environment is very unproductive, and (3) that bottom-up often works better than top-down.
That may be the greatest effect, in the long run, of the forces underlying opensource and blogging: finally ditching the old paternalistic employer-employee relationship, and replacing it with a purely economic one, between equals.
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