Extra OptiFine (ExOF) Addon for PureBDcraft implements two features.
The first is a special OptiFine feature to customise the look of several items and armours.
Just rename certain items in an anvil and you can get battleaxes, warhammers, new bows, crossbows, new armours, coloured Elytra and more!
The second is using Connected Textures with double slabs to give builders more creative expression.
Make sure you check out the “How to Use” thread on the forum!