Addon: ExtraBiomes
Author: WinEpicFin
ExtraBiomes adds 26 surface and underground environments with their own mobs, structures and building materials.

Its landscapes include frozen mesas and eroded peaks, Bryce deserts, jungle marshes and towering stone jungles, lush mesas, floating jungles, fungal forests and a rare futuristic desert. Deep glaciers hide ice caves rich in lapis, while tropical islands introduce palms and surrounding coral.

More unusual regions include the Grand Oasis with giant bones and hidden treasure, jellyfish-filled oceans, a glowing purple Mystic Forest, burnt basalt woodland and Dutch-inspired tulip fields with windmills. Existing Mushroom Islands and ice spikes also receive extensive changes.
Underground variants place jungles beneath tropical biomes, overhaul mushroom caves and mix the Deep Dark with buried vegetation. A floating Sky City serves as one of the largest exploration landmarks.

Bedrock textures include PBR maps for RTX packs and the modern shader system. Because world generation is heavily altered, a new save is recommended.
How to install the add-on
Download the .mcaddon or .mcpack file, open it with Minecraft and wait for the import to finish. Then enable the resource and behavior packs in the world settings. If the add-on requires experiments, turn them on before launching the world.