Musicolet - Musicolet is a small yet feature-rich offline Music Player for Android.
Sertifier - Best way to send smart certificates & open badges!
Palco MP3 - Palco MP3 is the largest Brazilian application for independent artists and offers more than 1 million songs for you to listen and download on your mobile device.
Credly - Used to post and verify educational credentials
Audiomack - The free SoundCloud alternative
Certopus - Design & Deliver verifiable certificates