https://sites.google.com/view/readings-on-history/home
https://sites.google.com/ashoka.edu.in/ashokahistoryarchive/home
https://sites.google.com/apu.edu.in/historymajor/useful-links
https://ibccdigitalarchive.lincoln.ac.uk/omeka/
https://guides.library.harvard.edu/history/digital
https://crl.du.ac.in/subjectportal/HISTORY/HISTORY.htm
https://www.thekarnatakahistorycongress.org/Home/Journal
https://karnatakaitihasaacademy.org/
https://indianhistorycollective.com/
https://www.southindianhistorycongress.org/journal
https://www.indianhistorycongress.com/
https://gazetteer.karnataka.gov.in/english
https://www.tnarchives.tn.gov.in/links.html
https://www.tnarch.gov.in/e-publication
https://asi.nic.in/publications/
https://sites.google.com/site/sastudycentre/home?authuser=0
Book Recommendations:
A History of Ancient and Early Medieval India by Upinder Singh
You will most likely find books from your syllabi that have an old publication date on https://archive.org/details/texts