Woodlands: The Core (Vanilla) changes some aspects of a worldgen, like trees, flowers, ground cover etc, using only vanilla blocks and vanilla biome distribution.

This project ia also a part of Woodlands:Extra, if you're interested in custom biomes (that use only vanilla blocks as well!) you can check it up! Don't install both!

Dependencies:

•  Oh The Trees You'll Grow by Corgi_Taco
•  Optional: any "Treecapitator"-like mod to chop down trees with non-decying leaves. Suggested: TreeChop, Tree Harvester, Pandas Falling Trees. Will require some changes to the configs to chop down persistent(non-decaying) leaves and make tree searching radius a bit bigger.

Compatible with Fabric! Just install Fabric Api 

Compatible with NeoForge! (>= v.1.21.1)

 

Compatible biome mods (mods on TerraBlender):

• Biomes O'Plenty
• Regions Unexplored
• Oh The Biomes We've Gone
• Serene Seasons
• Quark
• Mystic's Biomes
• Autumnity
• Nyctophobia
• River Redux
• Swampier Swamps
• Alex Caves
• Yung's Caves
• Blooming Nature
• Geophyllic Reforged
• Nature Arise
• Tectonic
• Nature's Spirit (Fabric)  

Partially compatible:

• William Wyther's Overhauled Overworld (works, but biomes may look unpredictable)
• William Wyther's Expanded Exosphere (works, but biomes may look unpredictable)
• Dynamic Trees (only vanilla trees will change)  

Incompatible (most datapack-based worldgen/biome mods)

• Litosphere 
• Exospherical Expansion
• Terralith
• Terraforged

P.S. Note that many of these could be made partially compatible if you'll make many changes to both Woodlands and them, but there will be no oficial compatibility ever.