What plugins do they use?

[wjdxo_]

The rank system seems to use the luck perm plugin.

 

[slimepvpxd]

The rank system seems to use the luck perm plugin.

it is luckperms

 

[MrSpeedy35]

Their developers code custom plugins for them.
The anticheat is not custom because anticheats are very complicated to make.
You can check out this video by Intel Edits:

View: https://www.youtube.com/watch?v=O1vZboxA7P4