Technic by RealBadAngel
Extensive machinery mod with electricity and ores.
Lava
A collection by csirolli
Packages
Magma by SuperStarSonic
Adds volcanoes, lava vents and new magma blocks
Magma Conduits by FaceDeer
Removes default mapgen lava and adds widely-spaced vertical lava "veins".
NC Vulcan by Winter94
Reworks Magma Generation in NodeCore.
Lava Ore Gen by Coder12
Makes the lava turn stone into ore over time.
Craftable Lava by MikeRedwood
Enables the crafting of lava from baked stone
Lava Stuff by LandarVargan
Adds lava armor, tools, and blocks