Hello! When installing Panda3D, there is an option called Maya plugins. Does this mean that Maya gets installed with Panda3D if we check this, or do we have to install it separately?
No, of course not. Maya is a commercial program that we cannot distribute for free. When you tick the “Maya plug-ins” option, the Maya plug-ins get installed, as the description states clearly.
What do maya plug-ins mean. I didn’t check. 
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The description states:
Plug-ins and scripts for Autodesk Maya (64-bit) that can be used to export models to Panda3D.
They are tools that can be used to convert models from Maya to the .egg format.
So like blend2bam and YABEE right?
Yes, except maya2egg.