VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
oandbackup - Make backups of selected apps on your device and restore from those backups.
AIMP - AIMP : Free Audio Player : Официальный сайт программы
Super Backup & Restore - Super Backup & Restore app allows users to backup all their stuff such as pictures, videos, apps, text messages, contacts, call history, and calendar data, etc.
foobar2000 - An advanced freeware audio player for the Windows platform.
SyncDroid - SyncDroid is basically and iOS and Android smartphone manager that lets the users of both smartphones to transfer their mobile content from one smartphone to another within few simple steps.