DU links:Study Material
https://sol.du.ac.in/library/index.php/digitallibrary#item-3
https://sol.du.ac.in/library/index.php/page/35
https://mhrd.gov.in/ict-initiatives
https://swayam.gov.in/
https://www.swayamprabha.gov.in/
https://ndl.iitkgp.ac.in/
http://epgp.inflibnet.ac.in/
https://www.e-yantra.org/
https://spoken-tutorial.org/
http://vlab.co.in/