World generator plugins
New terrain for new worlds: void and skyblock worlds, flat maps, custom biomes and generators.
Sample
VoidAtolls 1.1.0
A void world generator with small starter islands, made for skyblock-style and one-chunk challenges.
World Generators 2k
5.0 5.46.0
Sample 
New
MesaMaker 0.2.0
A terrain generator of red canyons, mesas and terracotta cliffs, with rivers at the bottom.
World Generators 210
5.46.0