National Knowledge Network
https://nkn.in/en/

InfoPort
https://infoport.inflibnet.ac.in/

Virtual Labs
https://www.vlab.co.in/

• FOSSEE
  https://fossee.in/

• Spoken Tutorial
  https://spoken-tutorial.org/

  • e-Yantra
    https://www.e-yantra.org/

• Directory of Open Access Books
  https://www.doabooks.org/