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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875votes
(Updated 23 April) Ready to talk biomes and dimensions? Here's how. Pinned
1686votes
(May/June 2018) Featured Topic: Underground!
819votes
Dimension: The Abyss
760votes
Natural Disasters
719votes
Waterfall Biomes
655votes
Deep Nether
489votes
Better Snowfall
402votes
Dinosaur Dimension
400votes
(Biome) Dead Forests
320votes
(July 2018) Featured Topic: The Swamp
314votes
Swamp Overhaul! (Pictures and Textures Included)
302votes
luminescent forest
285votes
City Biomes
270votes
(Nether Biome) Magma swamp
258votes
Nether Biome: Obsidian Shores
255votes
Frostland Dimension (was: New Dimension: Frostland)
243votes
Realistic Biome generation
217votes
New biome: withered island
213votes
Put the far lands back in the game.
204votes
Improvements to Rivers
175votes
Roofed Forest Overhaul!
156votes
(Java Parity) Nether should use the full 256 world height.
150votes
Brimstone Caves(Nether Update)
150votes
The Spirit World
120votes
Tropical islands
118votes
White sand beaches
113votes
(Nether update) Thermal vents
113votes
New Mountain Range Biome with higher building block limit/new mobs
112votes
Candy dimension (was: New dimension)