ArchitectureCraft Mod 1.8.9/1.8 for Minecraft
ArchitectureCraft Mod allows you to not only have sloped roofs but also blocks sloping in any direction, create round corners, arches, and other rounded structures, and give your windows nice-looking frames. This is a revamped and expanded version of Greg’s Blocks.
Detail and Download here : ArchitectureCraft Mod 1.8.9/1.8
See also : Minecraft mods 1.8