ReSlice - Slice your audio with an advanced, rhythmic arpeggiator and FX.
ChordIQ - Learn notes, chords, sight reading, perfect pitch and more.
nlog Synth - Professional Virtual Analogue Synthesizer ::: check nlogmusic at YouTube :::
muted.io - A magical collection of interactive music theory tools & visual reference pages for musicians and music producers
cassini - Polyphonic Synthesizer for iPhone/iPod touch
7Pad Scales and chords - Music instrument and assistant for playing scales and chords.