Cheat allows you to create and view interactive cheatsheets on the command-line. It was designed to help remind *nix system administrators of options for commands that they use frequently, but not frequently enough to remember.
cheat vs CheatKeys opinions
Not available for Windows. Only for Mac.
Ethervane ActiveHotkeys detects what global keyboard shortcuts (hotkeys) are currently registered on the computer by various applications. This helps you determine which hotkeys are in use, and which are still available.Discontinued
The program only supports 32 bit operating systems. Last version released: February 15, 2012.
Menu shortcuts are supposed to provide quick access to frequently used menu commands. But honestly: how many menu shortcuts do you know by heart? KeyCue helps you to use your Mac OS X applications more effectively by displaying a concise table of all currently available menu...