TortoiseSVN is a popular open-source client for the Subversion (SVN) version control system. Key features include: Windows shell integration Easy-to-use graphical interface Supports all SVN protocols Visual diff and merge tools Project history and log viewer Repository browser Revision graph functionality Integrated with Windows Explorer Can be used with any SVN server Supports authentication and encryption TortoiseSVN simplifies version control tasks for Windows users, making it easier to manage and track changes in software projects.