doubleTwist - Music Player for the Internet of Things. Described as the iTunes for Android, doubleTwist brings you music, radio and podcasts everywhere. Free download.

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.

Pulsar Music Player - Pulsar is tiny, ad-free and full featured music player with material design.

Gmvault - Backup the emails in your Gmail account.

iSyncr - iSyncr lets you sync iTunes playlists with your Android phone.

imapsync - Console-based utility for migrating IMAP mailboxes.