DirSync Pro is an open source synchronization and backup utility for Windows, Linux, Mac OS X, and all other operating systems that run Java. DirSync Pro is based on the program Directory Synchronize (DirSync), which was first released in February 2003 by E. Gerber. He subsequently developed it with Frank Gerbig and T. Groetzner. DirSync Pro was released by O. Givi in July 2008, based on a branch of the DirSync code.