Musicolet - Musicolet is a small yet feature-rich offline Music Player for Android.
AkrutoSync - Sync your Outlook contacts, calendar, tasks and notes on your PC direct with your phone via Wi-Fi or a cellular network.Buy · FAQ · Contact Us · SupportPeople also askWhat is Akrutosync?
Poweramp - Music Player for Android
DAVx5 - DAVx5 is a CalDAV/CardDAV management and sync app for Android.
doubleTwist - Music Player for the Internet of Things. Described as the iTunes for Android, doubleTwist brings you music, radio and podcasts everywhere. Free download.
EteSync - Secure, end-to-end encrypted and journaled personal information synchronization.