Various Night Vision Devices

Gimbal Payload Assembly MK-IV. (Probably same thing is  used on Nishant)

Bridge Layer based on Arjun chasis

Hydropneumatic Suspension for Armoured Vehicles

Ajeya Tank

Sarvatra Mobile Bridge

Arjun Tank

Corvette model

NISHANT UAV

 LAKSHYA PTA

Shaurya and Agni Missiles. (Interesting design of tip)

Akash, Nag and Brahmos

Torpedos. Bigger one is named Varunastra.

Kaveri Engine by GTRE