Here is the list of modules:
FvwmIconMan provides a list of running applications. You can run one or multiple managers and they can be configured to display different collections of windows.
This is a server that runs in the background allow you to issue commands to fvwm via FvwmCommand on the command line (say inside a terminal like xterm).
FvwmEvent can be configured to trigger on specific events. When the event is triggered, the module can run any command.
FvwmPager shows a ininature view of the Fvwm Desktops and Pages. This can be configured to show only the Current Desktop or any selection of Desktops.
FvwmIdent will create a window which contains information on the target window selected by the user.
The FvwmAuto module allows you to define actions for when the pointer enters and leaves a window after a specified delay. A common use of this would be to automatically raise windows, which is in fact the module's default behaviour. This can also be used to auto show/hide a panel/dock.
FvwmRearrange can be used to tile or cascade windows.
Displays an Fvwm Logo in the center of the screen for a set amount of time.
FvwmButtons provides a method to build docks, panels, taskbars, and more.
FvwmForm provides a way to build GUI forms that can be filled out and run custom commands.
FvwmConsole runs in a terminal (such as xterm) and allows one to send commands to the running instance of fvwm. This is a very useful module in testing new configurations.
This module animates iconification and de-iconification on command.
FvwmScript allows one to build graphical applications such as desktop accessories which can just display system info or be interactive.
This module will change the backgound/wallpaper when changing desktops. Any command can be executed when changing desktops so this module can be used for more than just switching the background.