This plugin allows you to view the corners of the chunk you are standing in. You can view 4x4, 8x8 and 16x16 size chunks.
It has 1 command: /viewchunks [4/8/16] or /vc [4/8/16] with the permission chunkviewer.use
This command will light up the corners of the chunk with glowstone. However only the player that used the command will see the corners. Meaning that others will not be bothered when someone else uses the command.
This plugin, as it is right now, is just a proof of concept. I want to know if there is interest in this kind of tool. I will add more features when requested.