TortoiseSvn
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Qt Creator supports subversion for ages already.
TortoiseSvn is just another client for subversion.
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Qt Creator uses the command line clients for version control.
For SVN on Windows, for example "slik SVN":http://www.sliksvn.com/ can be used.
The executable can be configured at Tools -> Options -> Version Control -> Subversion.
It does not necessarily need to be in the search path.