betaworldgen_mc1_9_4.jar for Minecraft 1.9.4 and LiteLoader.
betaworldgen_mc1_6_4.jar for Minecraft 1.6.4 and Forge.
This mod adds a new world type that uses the world generator from Minecraft Beta 1.7 updated to use the biomes from the version of Minecraft it is a mod for.
What this mod does that no other world generator or nostalgia mod does is it sets the grass, leaves and sky colour based on the temperature and rainfall values that it uses to choose the biome rather than the ones from the biome. This gets rid of the harsh transitions at the borders between biomes.
The biomes it uses are jungle, swampland, plains, forest, taiga, desert and ice plains.
simplehorses_mc1_9_4.jar for Minecraft 1.9.4 and LiteLoader.
simplehorses_mc1_6_4.jar for Minecraft 1.6.4 and Forge.
Not to be confused with Simply Horses.
This is a purely cosmetic mod that replaces the horse model with something more inline with the existing animals.