X11 server resource usage monitor

 xrestop uses the X-Resource extension to provide top(1)-like statistics
 for each connected X11 client's server-side resource usage. It is intended
 as a developer tool to aid more efficient server resource usage and debug
 server-side resource leakage.
 .
 xrestop requires the X-Resource extension, supported by XFree86 4.3 and
 above, and by the freedesktop.org X server.