Habitify - The easiest way to keep track of your habits
Send to Things - Add tasks to Things from your Android device
Habit List - Create good habits and break bad ones with the app that keeps you focused.
NOW UI kit by InVision - A beautiful cross-platform UI kit (PSD & Sketch)
Momentum - Agile goal and performance management
Elements for Sketch - High-quality UI Kits in Sketch, for free