Songspace – IOS & Android. SongSpace lets you draft lyrics, record audio and share access to your songs with friends and fellow songwriters. Free, iOS and Android.
Korg Kaossilator – IOS and Android – replicates parts of Korg’s freely playable synth.
Moog Filtatron – Filtatron takes the Moog Ladder Filter; allows you to import or record any sound into the app and give it the “Moog treatment.”
Casio Chordana Composer – chord encyclopedia – learn how to build any chord; This one is not necessarily for a beginner – it can be confusing.
Hum lyric-writing, note-taking and audio recording to help you organize your songwriting ideas.
SoundCloud on Mobile – Android and IOS.
FourTrack, by Sonoma Wire Works
Simple Songwriter, by Hopefully Useful