CopyPaste.me - Frictionless sharing between devices
SketchTool - Export pages & slices out of .sketch docs using CLI
SmartPaste - Copy-paste nicely styled text to apps like GMail and Google Docs without learning new shortcuts.
Select Similar Layers - Sketch plugin to select layers with the same attributes
Keyviz - Visualize your keystrokes in real-time
Base UI Sketch Framework - Huge set of everything you need to design and prototype