NDL
It provides educational materials from primary to postgraduate levels in all subject areas like Technology, Social Science, Literature, Law, Medical, etc.All types of resources, such as Books, Audio Books/Lectures, Video lectures, Lecture Presentations/Notes, Simulations, Question Papers, Solutions, etc. are available. It give access to huge volume of educational materials authored by large number of authors.Content of all languages are available. User interface available in widely used Indian languages.Library integrates contents from Institutional Digital Repositories of large number of Indian Educational and Research institutions
Link : https://ndl.iitkgp.ac.in/