KeyClu

This is a free, open-source application for macOS that allows you to see a summary of all the keyboard shortcuts and trackpad gestures available for any given application.

It is simple to install and configure; you just need to launch it and follow the wizard the first time you open it.

Basically, it involves assigning a key and its behavior to open the list of shortcuts. The great thing is that you can set it to open only when double-pressing and/or holding down a key, which saves you from shortcut conflicts or having to memorize yet another shortcut.

It has an integrated favorites system, so you can place the shortcuts you use the most at the top of the summary for each application.

It includes the option to export the list of all shortcuts in Markdown text format.

It responds very well, is lightweight on the system, and also allows you to customize many things.

It features integration with other gesture and custom shortcut applications.

During testing, it worked on practically all applications, except for DaVinci Resolve. Although it does work there, DaVinci handles windows a bit differently, so it doesn’t show the application’s actual shortcuts, but rather just the ones for the window, though it worked without any issues on all the rest.