ExtrabiomesXL

ExtrabiomesXL is a mod created by MisterFiber and TDWP_FTW, later maintained by Annysia, ScottKillen, and JLBShecky 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 much more uncommon thus harder to find. To increase the probability of Vanilla biomes, a config file for ExtrabiomesXL allows you to disable certain biomes as you wish. You can also disable whether or not NPC Villages spawn in certain biomes.

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, since then, it has been replaced mainly by Biomes O' Plenty in the FTB official 1.6.4 modpacks. It is not planned to be featured in any future FTB official modpacks though it can still be found in certain third-party modpacks.