Metals -harappans also made copper tools. they also made ornaments of gold and silver.
Writing- writing was very important for the harappans.Scribes helped prepare the seals and perhapswrote on other materials that have not survived.
Wheel- they used wheel in spinning and also in carts.
Plough- plough was a new tool, that was used to dig the earthfor turning the soil and planting seeds.