Dimensional Anchors Mod 1.7.10/1.7.2/1.6.4/1.6.2/1.5.2

It displays four things.
First, you can see a blue or orange box around all chunk loader blocks, even through walls. This is useful if you bury your chunkloaders and forget where they are, or if somebody tries to cause lag on SMP.
Blue boxes indicate chunkloaders you own, while orange boxes indicate chunkloaders owned by someone else. Orange boxes are only visible in singleplayer, to ops, or if they have been enabled in the server config (chunkloader.hideOtherPlayersLoadersInF9=false).For the rest of this section, a “visible chunk” means a chunk that is being kept loaded by a chunk loader you can see with a blue or orange box; if you can’t tell a chunk loader is there, you can’t tell which chunks it is keeping loaded.Second, a translucent blue border will be drawn around the chunk you are standing in, if it is visible. This border cannot be seen through walls, and helps to see whether your machines are all in the same chunk.

Third, a green line will be drawn in each corner of each visible chunk.

Fourth, a translucent red square will be drawn above your head height, in each visible chunk. It will be drawn once for each chunk loader – that is, if two or more visible chunk loaders are keeping the same chunk loaded (and thus the chunk is counting multiple times towards your limit) the red square will appear darker.
This *is* visible through walls and ceilings, so that you can see it indoors.