Obdy
Sires

Adds some pretty OP tools :)

Floof
Momo

Add BicBiomeCraft inspired biomes, tools, and items.

Ruby Tools+
ReinPlayz

Adds ruby ore, ruby tools, and ruby blocks balanced around diamond-tier gameplay.

Trucraft
mt-mods

An alternative crafting system done entirely in the world.

Metatool
SX

Provides API to register node metadata tools along with few useful tools

Grimoire
monk

Override tool functionality during runtime

Banshee
ElCeejo

Adds Banshees, a ghostly mob that haunts pine forests

Portal gun
AiTechEye

Portals and stuff

faction items
Giga_M

add some items to be used as prizes for special events or player achievements

Lakemaker Mod
sunnysideup

A TNT block that makes lakes/bodies of water.

Silver
Jackknife

adds silver ore and tools

Stair Pick
BrandonReese

This is a specialized pick for making stairs.

Too many ores
TeufloV

This adds 53 new ores. But most of them are useless.