How to see plugins on a Minecraft Server

I saw a post on here which showed how to see plugins on a Minecraft Server but it only showed 1 of the many ways you can see them. I'm going to tell you how to see it in many other ways, if not all. Please note that this will not work on all servers. It depends on what things the server has blocked. However, if one thing is blocked, doesn't mean the rest are.

Thank and Reps are appreciated!