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TortoiseSVN is a very easy to use SCM / source control software for Microsoft Windows. It is implemented as a Windows shell extension, which makes it integrate seamlessly into the Windows explorer. Since it's not an integration for a specific IDE you can use it with whatever development tools you like.
TortoiseGit is a Git revision control client, implemented as a Microsoft Windows shell extension. It is a port of TortoiseSVN for Git.
TortoiseHg is a shell extension of Mercurial SCM (Hg) for the MS-Windows Explorer. It is cross-platform and works under Linux too.