XyCraft

Supports Minecraft 1.4.5, 1.4.6, 1.4.7, 1.5.2

XyCraft is a technological mod that adds world generation plants and seeds, ores. It also adds aesthetic blocks, various machines such as the Fabricator, multiblock liquid storage devices, and fluid forms of Minecraft's dyes.

Mystcraft

Supports Minecraft 1.2.5, 1.3.2, 1.4.2, 1.4.4, 1.4.6, 1.4.7, 1.5.1, 1.5.2, 1.6.2, 1.6.4, 1.7.10, 1.7.2

Mystcraft is a recreation of the lore of the Myst series in Minecraft. It allows for the writing of and travel to new dimensions, called Ages.