CamoBlock plugin/SecretRooms plugin?

[Optonic]

I need a plugin for my server that would allow one way see through blocks and things like that. Are there any plugins for this or no?

[_Tarna_]

You could probably use skript and make a player see a certain block as glass or air so they can see through it. 

[Captainclimber]

You can do this in vanilla with Invisible Item Frames.

 

To get the item frame, you must be OP to run commands in game.

/give <player> minecraft:item_frame{display: {Name: '{"text":"Invisible Item Frame"}'}, EntityTag: {Invisible: 1b}}

Place the item frame on glass, and put a map inside the item frame. It doesn't matter what map. You can look through the glass part, but not the map side.