Hypefury - No idea what to share on Twitter?
Helio - Design successful products by revealing key user behaviors
Iceberger - Draw an iceberg and see how it will float
SongMine - Songmine is a free online tool for discovering and recording chord progressions with your favorite DAW.
My Twitter Inspiration Handbook - The best brand tweets grouped into categories.
Blocs Wave - A free audio app for creating music loops.