X Windowing Free Open Source Software at Windows Desktop

I am using a ssh session for my org Linux box to do all my installation work. Recently I installed a X Serve app but could not start its execution cause neither I am sure if X Server is running or not nor of how the app output (X windowing app) would be rendered on a Windows desktop from where I am doing a ssh.

So how do we know that X Server is running on a Linux box via a ssh session and which Free Open Source Software I can use to render the app output (running on Linux box) at Window Desktop?

You need to install an X server on the Windows system. It then can be used to display an X client application which is running elsewhere, i.e. on your Linux box.

Xming is a popular X server for Windows. There a lots of others.

You will have to install X server / X term application on windows. Some of the popular applications are:

Xmanager
MobaXterm
XTerm
Cygwin/X

Also, make sure you are forwarding X via ssh by using -X switch when starting your ssh session