Spectroid: what’s that sound? Do I hear that faint but annoying sound or just imagine it? With spectroid you can see the sound spectrum over time.
Nova launcher: Lets you cutomize the home screen of your phone and make it just right. I like my apps a bit closer together in five columns instead of four. Nova launcher let’s me do this.
Business calendar: it’s just so much better than the default calendar, especially if you have lots of meetings and need an information dense view.