imapsync is a tool for facilitating incremental recursive IMAP transfers from one mailbox to another. It is useful for mailbox migration or backup, and reduces the amount of data transferred by only copying messages that are not present on both servers. Read, unread, and deleted flags are preserved, and the process can be stopped and resumed. The original messages can optionally be deleted after a successful transfer.
XMT (XStream Migration Tool) is a library to migrate XStream serialized XML when the associated Java class evolves. XStream is a popular library to serialize a Java object to XML and back again, and XMT enables a smooth migration of this XML with the help of dom4j when you change the class definition of the Java object.