EssentialBlocks by BrutalSkillz16
Some useful blocks and items for doing all kinds of things in modded minecraft.
Redstone Gauges and Switches by wile
Adds redstone (metering) gauges, bistable switches (lever like), and pulse switches (button like) to the game.
IndustrialCraft 2 by Alblaka, Player, alexthesax, Elementalist, RichardG, Feanturi, tahu44, Lurch1985
Industrial age themed expansion for Minecraft.
Advanced custom world generator. Based on TerrainControl, which is based on R-T-B's PhoenixTerrainMod, which itself is based on Bucyruss' BiomeTerrainMod.
StepUp by NotTooManyItems
Allows for stepping up 1 block height without having to jump. Like in the game Trove. Client sided mod that works on singleplayer and some multiplayer servers.
Resource Exploit Fix by Sk1er, Punkeel
Fixes a critical bug in Minecraft 1.8 that can be exploited to check if files exist on a users' computer