CheatKeys - View Windows keyboard shortcuts in the current application.
Witch - Welcome to the world of W. i. t. c. h.
Hotkey Commander - Find out and override what hotkey combination is registered by which application.
Hyperswitch - HyperSwitch provides a compelling alternative to HyperDock for keyboard junkies. What's New
KeyCue - Menu shortcuts are supposed to provide quick access to frequently used menu commands.
Contexts - Switch between application windows effortlessly — with Fast Search, a better Command-Tab, a Sidebar or even a quick gesture. Free trial available.