Hello,
Those are individual software. Not plug in. Object Desktop is just a manager of those application. Object Desktop does not needed to be running in the background for each of those application running. For best experience, new user are recommend to install each one of those application one at a time and get to know with what each of the application does. Once you are comfortable with that application, you can than move on the another application and learn to know and use that application. That way you wont be overwhelm with what is going on with your system and which application that changing things on your system.
Thank you.
Basj,
Stardock Community Assistant.