There are 4 ways to view plugins:

1. Commands method: /pl /bukkit:pl etc.
2. Tab method: /ver [TAB] /about <TAB> etc.
3. TAB method: [TAB]:{commands}
4. Query plugins method: bukkit.yml

How to fix 1., 2., 3. methods:

• Use Plugin Hide
  • With this plugin you can disable methods 1., 2., 3. methods

How to fix 4. method:

• Go to the bukkit.yml and search query-plugins: true -> query-plugins: false
  • This prevents plugins from being requested via port (Default query port: 25565)
  • Query WEBSITE

There are several clients that use these methods, e.g.: MeteorClient A developer created an plugin specifically against the meteor client that helps hide plugins The plugin can log packets sent by meteor clients, so you can see if someone tries to use the methods

If you need further help, you can get it here: My discord server