Yagyavalkya - Science of Yagya
Vishwamitra - Science of Gayatri Sadhana
Kanada - Theory of Atom
Patanjali - Raja Yog
Bharadwaj and Charak - Ayurveda
Sushruta - Surgery
Aryabhat - Astrology and Mathematics
Garg - Principles of constellation
Bhaskaracharya - Mathematics
Bodhayan - Geometry
Koutilya - Economics & Political Sciences
Varahmihir - Astronomy
Nagarjuna - Chemistry
(Source: Presentation Chinmay Pandya)