AutoBlocks by iconmaster
A cuttable block autodetector like Immibis's Microblocks for Forge Multipart.
Now there are pretty barrier blocks in Minecraft that you can craft, and use to make something look, like its dangerous or noby may go in there!
Forever Enough Items by Elix_x
FEI === NEI for 1.9 === JEI + Chunk Edge Indicator + Light Level Overlay Reloaded + More