This project is abandoned. JavaMySimpleSynchronizer is a file system synchronizer, used to synchronize between a source directory to a destination directory. It copy source to destination with or without deleting files and directories only in destination.
Java Music Synchronizer (Jmync) allows synchronization of music files between two local paths for portable players. It allows you to specify a set of rules determining which files should be included. These rules can be based on file names or on ID3 tags.