Biome Bundle is a world pack for Open Terrain Generator which must be downloaded separately here.
Biome Bundle is a completely custom world generator containing a huge pack of over 400 original biomes with over 2000 structures including custom trees, rocks, caves, dungeons, villages and much more.
Biome Bundle has been created using Open Terrain Generator (required). The content consists of 4 main parts:
Custom biomes and terrain
Custom objects (trees, rocks, etc)
Custom structures (Dungeons, ruins, etc)
Custom mob spawn rules (in select biomes)