Too Many Biomes for Minecraft Forge 1.5.1 or 1.5.2 or 1.7.2
Latest version is 1.2.5
note: not compatible with 1.7.10, working on new version.
Adds new Biomes, mobs, blocks and plants. Rewrite of vanilla village and structure generation, and new villagers to trade with. Also includes Multiworld, a basic Dimension mod. Allows old world saves to be imported as a dimension or new ones created.
See [Official wiki offline] for more pictures, information, config options.
World Types IMPORTANT! read this page, many mod features depend on menu option selected on creating world.

Overview Not a single mod, but a collection of complementary mods bound together. All forge compatible. Consists of:
The 1.5.x version consists of two downloads
TooManyBiomes - Main mod MultiWorld - Controls extra Dimensions
The zip file contains both mods, extract it, then copy both zip files inside as is into to the mods folder.
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No files available for download.