Need Help! - Chunk Viewer (/chunkloaders)

I am playing on a modded server and would like to know what mod or plugin the server use to do /chunkloaders.

In de screenshot below you will see what it looks like when you enter the command /chunkloaders. There will open a second minecraft window that desplays every player online and the loaded chunks.

I would like to know the name of this mod or plugin. And also is there any other possibility to open this window without /chunkloaders?

I have found which mod provide /chunkloaders
The mod is called: ChickenChunks

But I would still like to know what kind of window opens when I type /chunkloaders.
Can I open this window manually without typing /chunkloaders?