doubleTwist - Music Player for the Internet of Things. Described as the iTunes for Android, doubleTwist brings you music, radio and podcasts everywhere. Free download.
Gmvault - Backup the emails in your Gmail account.
SyncMate - SyncMate is a Mac sync software which will sync Mac with Android, Nokia and Windows Mobile phones, iOS devices, other Macs, online accounts, etc.Android sync Mac - Devices - Free vs. Expert - SyncMate Customer Support .
imapsync - Console-based utility for migrating IMAP mailboxes.
SyncMe - Copy, move, sync and backup your mp3, pictures and documents over WiFi, cellular VPN or wired...
Cryoserver - Cryoserver is an all-in-one email archiving solution that empowers you to preserve your email in a tamper-evident archive, making you transform your data into a useful archive for everyday use.