Keyboard Wizard shows a visual representation of a standard QWERTY keyboard, allowing you to easily find keys that are unbound or conflicting. By default, the GUI is opened by pressing F7.
For more information such as the features and change log, check out my post over on the Minecraft Forums: http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/2802980-1-10-2-keyboard-wizard
It's open source! Check me out on GitHub: https://github.com/MrNerdy42/Keyboard-Wizard