Please read the pinned post on creating new biomes and dimensions. Remember that individual items, mobs, and structures should still go in their own categories - this is not a category for entire updates.

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1052votes
(Updated 23 April) Ready to talk biomes and dimensions? Here's how. Pinned
1736votes
(May/June 2018) Featured Topic: Underground!
965votes
Dimension: The Abyss
908votes
Natural Disasters
898votes
Waterfall Biomes
695votes
Deep Nether
557votes
Better Snowfall
496votes
Dinosaur Dimension
482votes
(Biome) Dead Forests
369votes
luminescent forest
366votes
Swamp Overhaul! (Pictures and Textures Included)
350votes
City Biomes
346votes
(July 2018) Featured Topic: The Swamp
302votes
(Nether Biome) Magma swamp
300votes
Nether Biome: Obsidian Shores
298votes
Realistic Biome generation
296votes
Frostland Dimension (was: New Dimension: Frostland)
296votes
Improvements to Rivers
278votes
Put the far lands back in the game.
259votes
New biome: withered island
223votes
(Java Parity) Nether should use the full 256 world height.
196votes
Roofed Forest Overhaul!
169votes
Brimstone Caves(Nether Update)
167votes
The Spirit World
165votes
Lavender Oasis (End update)
165votes
Tropical islands
160votes
End Forest and End Core
158votes
New dimension: moon
146votes
New Mountain Range Biome with higher building block limit/new mobs