Chordify - Chordify turns any music or song (YouTube, Deezer, SoundCloud, MP3) into chords.
FL Studio Mobile - Create & save multi-track music projects on a smartphone
muted.io - A magical collection of interactive music theory tools & visual reference pages for musicians and music producers
Splice Beat Maker - Make and share beats in your browser
soundrop - Soundrop is an app that allows you to create your own personalized sound track to keep you focused or relax.
Sampulator - Make (and record) beats on your keyboard