There are many free tools available that can help you synchronize your desktops and laptops. Command-line devotees might want to try their hand at Unison, an open-source UNIX/Windows program with a respectable pedigree, or try a UNIX tool such as rsync, which requires a wrapper for Windows use. Windows Vista and Windows XP both have features that help users synchronize files, and Microsoft also has a popular free tool, SyncToy, which helps users sync files between folders and computers. Here's a short list of free tools to investigate.