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



Shaurya and Agni Missiles. (Interesting design of tip)

Akash, Nag and Brahmos

Above pics are from DRDO’s outdoor section. Below are 2 pictures from L&T; section

From Wiki:  Pinaka is a multiple rocket launcher produced in India and developed by the DRDO for the Indian Army. The system has a maximum range of 39-40 km, fire a salvo of 12 HE rockets in 44 seconds, neutralizing a target area of 3.9 sq. km. The system is mounted on a Tatra truck for mobility.

Pinaka saw service during the Kargil War, where it was successful in neutralizing enemy positions on the mountain tops. It has since been inducted into the Indian Army in large numbers.

From Wiki: :  The Arjun features a 120 mm main rifled gun with indigenously developed APFSDS ammunition which has capability of defeating superior armor, one 7.62 mm coaxial machine gun, and a 12.7 mm machine gun. It is powered by a single MTU multi-fuel diesel engine rated at 1,400 hp, and can achieve a maximum speed of 70 km/h (43 mph) and a cross-country speed of 40 km/h (25 mph). It has a 4-man crew: commander, gunner, loader and driver. Automatic fire detection and suppression, and NBC protection systems are provided. All-round anti-tank warhead protection by the newly developed Kanchan armour is claimed to be much higher than available in present third generation tanks