ExtrabiomesXL is a mod created by ScottKillen, MisterFiber and TDWP_FTW, later maintained by the ExtrabiomesXL Development Team that adds 28 new biomes to Minecraft and creates much more biome diversity than in vanilla Minecraft. This mod includes several new biomes, trees, blocks, and items to enhance gameplay and create more exploration.
Important Note: Adding ExtrabiomesXL to Minecraft has one major con: vanilla biomes become harder to find. To increase the probability of Vanilla biomes, a config file for ExtrabiomesXL allows certain biomes to be disabled. Whether or not NPC Villages spawn in certain biomes is also configurable.
Installing this mod also causes NPC Villages to generate in every biome in Minecraft although they seem to generate in more flatter regions over mountainous regions. As stated above village generation can be disabled for specific biomes via the ExtrabiomesXL config file.
ExtrabiomesXL was featured in FTB official 1.4.7 modpacks, however, it has been replaced mainly by Biomes O' Plenty in the FTB official 1.6.4 modpacks and later. It is not planned to be featured in any future FTB official modpacks though it can still be found in certain third-party modpacks.
Acacia· Bald Cypress· Cypress· Fir· Japanese Maple· Japanese Maple Shrub· Rainbow Eucalyptus· Redwood· Sakura
Leaves
Autumn
Vermillion· Goldenrod· Citrine· Umber
Other
Acacia· Bald Cypress· Cypress· Fir· Japanese Maple· Japanese Maple Shrub· Rainbow Eucalyptus· Redwood· Sakura
Flowers
Amaryllis
Pink Amaryllis· Red Amaryllis· White Amaryllis
Gerbera
Orange Gerbera· Pink Gerbera· Red Gerbera· Yellow Gerbera
Lilies
Lily· Black Calla Lilies· Pink Oriental Lily· White Calla Lilies
Others
Allium· Bachelor's Button· Bells of Ireland· Bluebell· Blue Iris· Blue Poppy· Buttercups· Cattail· Daisy· Dandelion· Delphinium Belladonna· Gardenia· Gloriosa· Hydrangea· Lavender· Marsh Marigold· Pansy· Poppy· Purple Iris· Red Rover· Snapdragon· Tulip· Violet· Yarrow
Grasses
Brown Grass· Short Brown Grass· Dead Grass· Tall Dead Grass· Eelgrass· Dead Yellow Grass
Other
Leaf Pile· Strawberry· Tiny Cactus· Toad Stool
Blocks
Logs
Normal
Autumn· Acacia· Bald Cypress· Cypress· Fir· Japanese Maple· Rainbow Eucalyptus· Redwood· Sakura
Quarter
Bald Cypress· Fir· Oak· Rainbow Eucalyptus· Redwood
Elbow
Bald Cypress· Rainbow Eucalyptus
Planks
Autumn· Acacia· Bald Cypress· Cypress· Fir· Japanese Maple· Rainbow Eucalyptus· Redwood· Sakura
Slabs
Autumn· Acacia· Bald Cypress· Cypress· Fir· Japanese Maple· Rainbow Eucalyptus· Redwood· Sakura
Stairs
Autumn· Acacia· Bald Cypress· Cypress· Fir· Japanese Maple· Rainbow Eucalyptus· Redwood· Sakura
Fences
Autumn· Acacia· Bald Cypress· Cypress· Fir· Japanese Maple· Rainbow Eucalyptus· Redwood· Sakura
Fence Gates
Autumn· Acacia· Bald Cypress· Cypress· Fir· Japanese Maple· Rainbow Eucalyptus· Redwood· Sakura
Doors
Autumn· Acacia· Bald Cypress· Cypress· Fir· Japanese Maple· Rainbow Eucalyptus· Redwood· Sakura
Red Rock
Red Cobblestone· Red Rock· Red Rock Brick· Red Cobblestone Slab· Red Rock Slab· Red Rock Brick Slab· Red Cobblestone Stairs· Red Rock Brick Stairs· Red Cobblestone Wall