Corrosion-resistant iron: The first corrosion-resistant iron was used to erect the Iron pillar of Delhi, which has withstood corrosion for over 1,600 years.[29]

Crucible steel: Perhaps as early as 300 BCE—although certainly by 200 CE—high quality steel was being produced in southern India also by what Europeans would later call the crucible technique.[33] In this system, high-purity wrought iron, charcoal, and glass were mixed in a crucible and heated until the iron melted and absorbed the carbon.[33] The first crucible steel was the wootz steel that originated in India before the beginning of the common era.[34] Archaeological evidence suggests that this manufacturing process was already in existence in South India well before the Christian era.[35][36]

Dentistry, dental drill, and dental surgery: The Indus Valley Civilization has yielded evidence of dentistry being practiced as far back as 7000 BCE.[37] This earliest form of dentistry involved curing tooth related disorders with bow drills operated, perhaps, by skilled bead craftsmen.[38] The reconstruction of this ancient form of dentistry showed that the methods used were reliable and effective.[39]

Dock (maritime): The world's first dock at Lothal (2400 BCE) was located away from the main current to avoid deposition of silt.[57] Modern oceanographers have observed that the Harappans must have possessed great knowledge relating to tides in order to build such a dock on the ever-shifting course of the Sabarmati, as well as exemplary hydrography and maritime engineering.[57] This was the earliest known dock found in the world, equipped to berth and service ships.[57]

Hospital: Brahmanic hospitals were established in what is now Sri Lanka as early as 431 BCE.[64] The Indian emperor Ashoka (ruled from 273 BCE to 232 BCE) himself established a chain of hospitals throughout the Mauryan empire (322–185 BCE) by 230 BCE.[64] One of the edicts of Ashoka (272—231 BCE) reads: "Everywhere King Piyadasi (Asoka) erected two kinds of hospitals, hospitals for people and hospitals for animals. Where there were no healing herbs for people and animals, he ordered that they be bought and planted."[65]

Oven: The earliest ovens were excavated at Balakot, a site of the Indus Valley Civilization. The ovens date back to the civilization's mature phase (c. 2500-1900 BCE).[60]

Plastic surgery: Plastic surgery was being carried out in India by 2000 BCE.[99] The system of punishment by deforming a miscreant's body may have led to an increase in demand for this practice.[99] The surgeon Sushruta contributed mainly to the field of Plastic and Cataract surgery.[100] The medical works of both Sushruta and Charak were translated into Arabic language during the Abbasid Caliphate (750 CE).[101] These translated Arabic works made their way into Europe via intermidiateries.[101] In Italy the Branca family of Sicily and Gaspare Tagliacozzi of Bologna became familiar with the techniques of Sushruta.[101]

Private bathroom and Toilet: By 2800 BCE, private bathrooms, located on the ground floor, were found in nearly all the houses of the Indus Valley Civilization.[107] The pottery pipes in walls allowed drainage of water and there was, in some case, provision of a crib for sitting.[107] The Indus Valley Civilization had some of the most advanced private lavatories in the world.[107] "Western-style" toilets were made from bricks using toilet seats made of wood on top.[107] The waste was then transmitted to drainage systems.[107]

Sewage collection and disposal systems: Large-scale sanitary sewer systems were in place in the Indus Valley by 2700 BCE.[107] The drains were 7–10 feet wide and 2 feet (0.61 m) below ground level.[107] The sewage was then led into cesspools, built at the intersection of two drains, which had stairs leading to them for periodic cleaning.[107] Plumbing using earthenware plumbing pipes with broad flanges for easy joining with asphalt to stop leaks was in place by 2700 BCE.[107]

Binary numbers: The modern system of binary numerals appears in the works of German polymath Gottfried Leibnitz during the 17th century. However, the first description of binary numbers is found in the chandaḥ-śāstra treatise of the Indian mathematician Pingala.[165][166]
Binomial coefficients: The Indian mathematician Pingala, by 300 BCE, had also managed to work with Binomial coefficients.[167][168]

Fibonacci numbers: In mathematics, the Fibonacci numbers are a sequence of numbers named after Leonardo of Pisa, known as Fibonacci.[189] Fibonacci's 1202 book Liber Abaci introduced the sequence to Western European mathematics, although the sequence had been previously described in Indian mathematics.[189] The so-called Fibonacci numbers were also known to the Indian mathematician Pingala by 300 BCE.[168]

Pythagorean theorem, statement of: Baudhayana (c. 8th century BCE) composed the Baudhayana Sulba Sutra, the best-known Sulba Sutra, which contains examples of simple Pythagorean triples, such as: (3,4,5), (5,12,13), (8,15,17), (7,24,25), and (12,35,37)[201] as well as a statement of the Pythagorean theorem for the sides of a square: "The rope which is stretched across the diagonal of a square produces an area double the size of the original square."[201]

Atomism: The earliest references to the concept of atoms date back to India in the 6th century BCE.[228][229] The Nyaya and Vaisheshika schools developed elaborate theories of how atoms combined into more complex objects (first in pairs, then trios of pairs).[230][231] The references to atoms in the West emerged a century later from Leucippus whose student, Democritus, systematized his views.

Formal language and formal grammar: The 4th century BCE Indian scholar Pāṇini is regarded as the forerunner to these modern linguistic fields.[240]

I think we can get a fairly good idea by looking at the above just how incredible the contributions by Indian civilisation is to civilisation.

The trade started by Eudoxus of Cyzicus in 130 BCE kept increasing, and according to Strabo (II.5.12.):[9]
“ "At any rate, when Gallus was prefect of Egypt, I accompanied him and ascended the Nile as far as Syene and the frontiers of Kingdom of Aksum (Ethiopia), and I learned that as many as one hundred and twenty vessels were sailing from Myos Hormos to India, whereas formerly, under the Ptolemies, only a very few ventured to undertake the voyage and to carry on traffic in Indian merchandise." ”

By the time of Augustus up to 120 ships were setting sail every year from Myos Hormos to India.[9] So much gold was used for this trade, and apparently recycled by the Kushan Empire (Kushans) for their own coinage, that Pliny the Elder (NH VI.101) complained about the drain of specie to India:[10]
“ "minimaque computatione miliens centena milia sestertium annis omnibus India et Seres et paeninsula illa imperio nostro adimunt: tanti nobis deliciae et feminae constant. quota enim portio ex illis ad deos, quaeso, iam vel ad inferos pertinet?"
"India, China and the Arabian peninsula take one hundred million sesterces from our empire per annum at a conservative estimate: that is what our luxuries and women cost us. For what percentage of these imports is intended for sacrifices to the gods or the spirits of the dead?" - Pliny, Historia Naturae 12.41.84.

In other words based on this data we can clearly see in terms of economy and production the Indians were the dominant civilisations of this planet in the ancient world, even at the height of the Roman and Islamic empire. It is Western-centric history that teaches us the Romans were the most powerful force on this planet in the past, but the evidence shows that Asia was the most powerful.