OTG is a much more advanced world generator, which will replace the standard. By itself it does not add new types of generation, and is a platform using which you can without any java knowledge to create worlds, or to download packs from any vendor.
How to install Open Terrain Generator Mod
- Download and install Minecraft Forge
- Download mod
- Do not unzip it, copy to C:\Users\User_Name\AppData\ Roaming\.minecraft\mods