Trillion O Trees

The mod spreads new tree species across overworld forests and biomes, so terrain gains more variety than vanilla generation provides. A few generated structures are included as well. The author notes the project is still in pre-release, so content and balance may change between builds.

New wood types are added along with the trees. Signs, boats and most wood-based items are supported, and crafting with the new wood works. Only the NeoForge loader is covered. Files target 1.21.1 alone, and the mod is released under All rights reserved, so it is not open source. Both the server and every player need it, because it changes world generation and recipes.