() = no. of variants
Arjun (6) The Arjun was delayed by many decades so each upgrade is very different



8x8 CBRN

Kestrel WhAP

Kestrel UT-30

Sarath (2) License built Indian Bmp-2 with Indian upgrades and indigenous parts
Medak: A heavy upgrade of the Sarath that was already upgraded so it’s basically indigenous
Sarath II: Heavily upgraded Sarath with more modern equipment, better Armour and more

Abhay

Zorawar Mahajan: 1x 105mm Cockerill 3105 cannon (APFSDS, HESH, CLGM)
1x 12.7mm NSV Machine Gun (RCWS)
1x 7.62mm PKT Machine Gun (Coax.)
Zorawar LT: 1x 105mm Cockerill 3105 cannon (APFSDS, HESH, CLGM)
2x Nag ATGM Launchers
1x 12.7mm NSV Machine Gun (RCWS)
1x 7.62mm PKT Machine Gun (Coax.)
The Zorawar LT has ATGMs and side pontoons unlike the Zorawar Mahajan.
M4A1E6 Sherman: upgraded Sherman using a 17-pounder, upgraded suspension, and improved engine
M4A4 SA50: Indigenous combination of an M4A4 and an Amx-13’s SA-50 cannon
M4A1E6/9 Sherman: further upgrade of the E6 Sherman with an even better suspension and engine
T-55 Gulmohar: modernization of the T-55 by using 105MM L7 cannons from their Vijayanta tanks
Ajeya 1 and 2: Ajeya Mk.1 is just a T-72M1 and the Ajeya Mk.2 adds ERA blocks and some minor improvements
CL Ajeya: A heavily upgraded/modernised Ajeya with a new FCS, TFS, Radio, Navigation, and Optical systems. Can also fire CLGMs
Atharva: The main difference between this and the Ajeya is a T-90 turret used on the Bhishma
Bhishma 1 and 2: Bhishma MK.1 is a T-90 and Bhishma MK.2 has some minor upgrades
Bhishma MK.3:
“The Bhishma Mk.III is the latest version of the Bhishma to date, first being announced in May 2024, The Bhishma Mk.III sees significant upgrades, seeing a majority of its parts such as its thermals, engine, and LRF being designed and built in India, and now includes technologies and equipment found on India’s Arjun MBT’s such as its FCS, and is reportedly capable of firing the SAMHO ATGM and Mk.II APFSDS. Further technologies such as a APS, loitering munitions, and other upgrades are also planned for later production blocks.”
Bhishma II: locally produced T-90MS with a majority of its parts being indigenously designed and built
Churchill Mk.VII CS: equipped with a 95 mm gun by the British Raj
Vijayanta Mk.IA: indigenous FCS, improved sight mounts, and muzzle reference system. There are more minor upgrades as well
Vijayanta Mk.1B: new Laser rangefinder and FCS
Vijayanta Mk.1C: Final variant with Add-on armour to the turret and hull
Vijayanta Mk.2 (nothing like the original Vijayanta):
“The Vijayanta Mk.2 was the product of the late-80’s “Bison” Upgrade Program, in and effort to fully modernize the Vijayanta tanks, the Mk.2s would borrow technologies from the Arjun program, specifically the newly-developed “Kanchan” composite Armor, being added to the turret and hull; The addition of the Yugoslav SUV-T55A fire control system and thermals; A modern land navigation system; And the engine of a T-72 to counter all the new weight. 4 total prototypes were created and tested in the 1990’s, however issues such as overheating and the breakdown of parts would lead to the abandonment of the program in 1997.”
see for yourself
Karna (parade variants of the Arjun)

ACV IP Mk.IIA: one of the first indigenous armoured cars used by India, however it’s armament is pretty mediocre with only a 14mm Boys Anti-Tank rifle and a 7.7mm Bren machine gun. I’m not sure if it can pen 1.0 - 2.0 tanks or not.
Garuda 105: mobile light howitzer
M-46 Catapult:

I don’t know what to say, it has a 130 MM howitzer strapped onto a lengthened Vijayanta hull
TATA L/52: Light weight mobile howitzer (155mm)
M-46 ACS: same as the Vijayanta catapult but using an Arjun hull with improved survivability
Jonga 106:
Nissan jeep with a 106mm recoilless rifle
Ajeya GCT F1: Ajeya hull with an AuF1 turret
Jonga SS.11 B1: locally produced jeep with three SS.11B1s

Gypsy AT: locally produced jeep with an ATGM launcher

Windy 505: locally produced jeep with an ATGM launcher
Mahindra Striker: same as above but with a different jeep and ATGM

BRDM-II Striker: BRDM with 5 Konkur ATGMs
Namica TD: Tech demonstrator using the BMP-2 chassis with 2x indigenous NAG ATGMs

Namica (P): 4x NAG ATGMs

this is just half of the tree, not to mention that the SPAAs and SAM carriers are even more indigenous because India is highly advanced when it comes to missiles with multiple variants of ATGMs, Cruise missiles, and more. And India has many indigenous Ammo types.