1. Narayana Murthy and Nandan Nilekani - Infosys:
The story of Infosys is almost synonymous with the rise of India's IT industry. Narayana Murthy, along with six other engineers, founded Infosys in 1981. His vision was to build a company that would be a globally respected corporation, which would benchmark itself against the best in the world. Nandan Nilekani, another co-founder, took the company to new heights with his leadership, focusing on innovation and client satisfaction. Nilekani's later role in the Aadhaar project showcased how technology could revolutionize governance.

2. Azim Premji - Wipro:
Often referred to as the Czar of the Indian IT Industry, Azim Premji took over Wipro at the age of 21 when his father passed away. Under his stewardship, Wipro transformed from a hydrogenated cooking fat company into one of the world's leading IT services firms. His emphasis on quality and customer focus has been a cornerstone of Wipro's success. Premji's philanthropy, especially in education, through the Azim Premji Foundation, highlights his commitment to giving back to society.

3. Shiv Nadar - HCL:
Shiv Nadar, the founder of HCL, has been instrumental in putting India on the global IT map. HCL's philosophy under Nadar's guidance has been about innovation, entrepreneurship, and a relentless focus on research and development. His vision extends beyond business to education, with the establishment of the Shiv Nadar University, aiming to create an institution of global standards.

4. Kiran Mazumdar-Shaw - Biocon:
Though primarily known in the biotech sector, Kiran Mazumdar-Shaw's journey is a testament to how technology and innovation can disrupt traditional industries. Starting Biocon in her garage, she built it into one of the largest biopharmaceutical companies in India. Her focus on R&D, especially in affordable medicine, showcases how technology can be leveraged for societal benefits.

5. N.R. Narayana Murthy - A Global Visionary:
While already mentioned for his role at Infosys, Murthy's broader impact on the tech ecosystem in India deserves a special mention. His philosophy of treating employees as partners, his emphasis on corporate governance, and his vision for making India a hub for software services have inspired a generation of entrepreneurs.

6. Bhavish Aggarwal - Ola and Ola Electric:
Representing the new guard of tech tycoons, Bhavish Aggarwal has been at the forefront of the ride-hailing and electric mobility revolution in India with Ola Cabs and Ola Electric. His vision is to reduce India's dependence on fossil fuels and promote sustainable transport solutions, aligning with global trends towards green technology.

These tech tycoons have not only driven economic growth but have also been instrumental in creating a culture of innovation, entrepreneurship, and social responsibility. Their legacies are not just in the companies they've built but in the countless lives they've touched through employment, education, and philanthropy. As India continues its march towards becoming a tech superpower, these visionaries serve as guiding lights, showing that technology can indeed be a powerful force for change, both in business and in society at large. Their stories remind us that with vision, perseverance, and a commitment to excellence, the future can indeed be shaped for the better.