Travel around the world without barriers: RoadArchitect automatically scans your world, finds villages, and other structures, and then lays a network of roads between them.
Adds a lot of aggressive mobs, with their unique properties that can diversify and complicate your survival. Also adds new structures, equipment, blocks and achievements.
Gives you full control over spawning mobs/spawners. Add custom AI to mobs, give them better weapons, and block burning in sunlight. You decide what your mobs do and when they can spawn!