To install Appimages from Appimagehub via CLI use appimage-cli-tool. This allows you to e.g. search appimages with "app search xyz" and install any appimage via command "app install #id".
If you are a developer who is interested to easily build appimages from your code repo, read the guide here.
pekwm is a window manager that once upon a time was based on the aewm++ window manager, but it has evolved enough that it no longer resembles aewm++ at all. It has a much expanded feature-set, including window grouping (similar to ion, pwm, or fluxbox), autoproperties, xinerama, keygrabber that supports keychains, and much more.