imapsync - Console-based utility for migrating IMAP mailboxes.
doubleTwist - Music Player for the Internet of Things. Described as the iTunes for Android, doubleTwist brings you music, radio and podcasts everywhere. Free download.
MailStore - MailStore Home - A 100% free single-private-user desktop solution
Pulsar Music Player - Pulsar is tiny, ad-free and full featured music player with material design.
audriga Email and Groupware migration - Easily migrate your email, contacts, calendar items and tasks to your new provider or server. No software installation is required.
iSyncr - iSyncr lets you sync iTunes playlists with your Android phone.