Agni-I is a medium-range ballistic missile developed by DRDO of India under the Integrated Guided Missile Development Program. It is a single-stage missile developed after the Kargil War to fill the gap between 250 km range of Prithvi-II and 2,500 km range of Agni-II.
Some Indian Missile Projects
1.Project Devil was one of two early liquid-fuelled missile projects developed by India, along with Project Valiant, in the 1970s
2.IGMDP-The Integrated Guided Missile Development Program (IGMDP) was a Ministry of Defence (India) program for the research and development of a comprehensive range of missiles.
Some Indian Missiles 
1.Aakash is a medium-range mobile surface-to-air missile.
2.TrishulNag is a third generation "Fire-and-forget" anti-tank missile developed in India.
3.Prithvi Missiles are tactical surface-to-surface short-range ballistic missiles (SRBM)
4.The Agni missile series started as a "Re-Entry Vehicle" project (later rechristened as Agni Technology Demonstrator) in the IGMDP
Agni-I    MRBM    One    700 km – 1,200 km
Agni-II    IRBM    Two    2,000 km – 2,500 km
Agni-III    IRBM    Two    3,000 km – 5,000 km
Agni-IV    IRBM    Two    2,500 km – 3,700 km
Agni-V    ICBM    Three    5,000 km – 8,000 km
5.The Shaurya missile is a short-range surface-to-surface ballistic missile developed for use by the Indian Army.
6. BrahMos-Mach 3 Supersonic Cruise Missile developed in collaboration with Russia
7. Nirbhay-Long Range Sub-Sonic Cruise Missile
8.Prahaar is a solid-fuelled Surface-to-surface guided short-range tactical ballistic missile 
9.Helina-A variant of NAG Missile to be launched from Helicopter is being developed under the Project named HELINA (HELIcopter launched NAg)It will be structurally different from the Nag.