Titanium Backup - Titanium Backup is a very old backup app that has been around since the early days of Android. In fact, it's one of the few apps that covers all versions from 1. Read more about Titanium Backup.
VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
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.
AIMP - AIMP : Free Audio Player : Официальный сайт программы
SMS Backup+ - Backup Android SMS, MMS and call log to Gmail / Gcal / IMAP - jberkel/sms-backup-plus
foobar2000 - An advanced freeware audio player for the Windows platform.