FvwmProxy is a FVWM2 module that allows the user to locate and control windows obscured by other windows by using small non-overlapping proxy windows.
With a configured key press, the proxy windows are activated. Proxy windows are always on top and try to center on the regular window they proxy. A simple collision algorithm tweaks the positions of the proxy windows to prevent them from overlapping. Pressing the left or right mouse buttons on a proxy window can raise or lower the associated proxied window respectively.