Pretzel - Keyboard shortcuts for the app you're currently using
Runner Pro - Perform Sketch actions quicker with your keyboard
KeyCue - Menu shortcuts are supposed to provide quick access to frequently used menu commands.
SketchKeys - Learn Sketch shortkeys easily w/ keyboard stickers
Hotkey Commander - Find out and override what hotkey combination is registered by which application.
Stacky - Simple app enhancing windows task bar functionality with stacks of shortcuts.