John's Background Switcher - Switch backgrounds to trending imgur, reddit, tumblr threads
Digit - SMS bot that monitors your bank account & saves you money
Variety Wallpaper Changer - Variety is a wallpaper changer for Ubuntu which is featureful, yet slim and very easy to use.
Spendee - See where your money goes
Muzei - Muzei is a live wallpaper that gently refreshes your home screen each day with famous works of art.
Olivia - Your new best friend built with an artificial neural network