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.

Since TortoiseSVN is a Windows shell extension, it integrates in the file explorer. That means you can use it with the tool you are most familiar with.

• all commands are available directly from the windows explorer.You can choose which entries TortoiseSVN should show in the top context menu and which it should put in the submenu.
  

  only commands that make sense for the selected file/folder are shown. You won't see any commands that you can't use in your situation.

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• See the status of your files directly in the Windows explorer. Inside the Windows Explorer, TortoiseSVN shows you the state of the files with overlay icons. The following screenshot shows all available overlays, but usually you will only see a few of them.
  
  If you use the Windows Explorer in details view, TortoiseSVN can add additional columns so you have all the information available:
  
• descriptive dialogs, constantly improved due to user feedback
• allows moving files by right-dragging them in the windows explorer.
  

The dialog you most likely will be using the most is the commit dialog. Whenever you commit your changes, you will use that dialog. That's why we made that dialog very powerful, with a lot of features which help you write log messages and discover local changes.

Powerful commit dialog

• integrated spell checker for log messages. You can download the spellchecker modules separately. And with the tsvn:projectlanguage property, you can even set a different language for the spellchecker for every project.
  
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• auto completion of paths and keywords of the modified files.
  
• text formatting with special chars. For example, text in between '*' chars is made *bold*, text in between '^' chars is made ^italic^, and text in between '_' chars is _underlined_.
  
• right-clicking on any file entry will show a context menu where you can execute commands like revert, diff with BASE, set properties in case you forgot to before, and many more.
• A doubleclick on a modified file will open the diff program, so you can immediately see what you have changed in every file you want to commit.

All Subversion protocols are supported

• http://
• https://
• svn://
• svn+ssh://
• file:///
• svn+XXX://

• Can create a graph of all revisions/commits. You can then easily see where you created a tag/branch or modified a file/folder.
  
• Graphs of commit statistics of the project.
  
• Easy comparing of two branches or tags.
  

TortoiseMerge

• Shows changes you made to your files.
• Helps resolving conflicts.
• Can apply patchfiles you got from users without commit access to your repository.
  

TortoiseBlame

to show blames of files. Shows also log messages for each line in a file.

TortoiseIDiff

to see the changes you made to your image files/p>

SubWCRev

to include the revision numbers/dates/... into your source files