Send to Things - Add tasks to Things from your Android device
Now UI Kit - A beautiful Bootstrap 4 UI kit. Yours free.
NOW UI kit by InVision - A beautiful cross-platform UI kit (PSD & Sketch)
UX Toolkit for Figma - Create beautiful user flow charts, sitemaps and wireframes
Elements for Sketch - High-quality UI Kits in Sketch, for free
Landing UI Kit - Handcrafted UI components for landing pages