TortoiseSVN is a really easy to use Revision control / version control / source control software for Windows. It is based on Subversion. TortoiseSVN provides a nice and easy user interface for Subversion.
It is developed under the GPL. Which means it is completely free, including the source code. But just in case you don't know the GPL too well: you can use TortoiseSVN to develop commercial applications or just use it in your company without any restrictions.
Since it's not an integration for a specific IDE like Visual Studio, Eclipse or others, you can use it with whatever development tools you like.
As a Subversion client, TortoiseSVN has all the features of Subversion itself, including:
- Most current CVS features.
- Directories, renames, and file meta-data are versioned.
- Commits are truly atomic.
- Branching and tagging are cheap (constant time) operations.
- Efficient handling of binary files.
- BUG: Error text returned from a repository hook script could get split up wrong if empty lines were in the text.
- BUG: If the currently shown folder in the repository browser was renamed, the url bar did not change to the new url.
- BUG: Unversioned items selected for reverting would move them to the trash bin instead of leaving them.
- BUG: Deleting an item in the repository browser that had non-ascii chars in it didn't work.
- BUG: TortoiseMerge showed a black line diff in one-pane view.
- BUG: The styling of bug IDs in the commit dialog could fail.
- BUG: TortoiseMerge added a newline at the end of a file when saving modifications.