Samskrita Bharati related:
Samskrita Bharati USA: http://samskritabharatiusa.org/
Samskrita Bharati India: http://samskritabharati.in/
Dictionaries
Grammar resources
Ashtadhyayi.com https://ashtadhyayi.com/
Conjugation and Declension Engine: http://sanskrit.inria.fr/DICO/grammar.html
Documents
Sanskrit Documents site: http://sanskritdocuments.org/
Prapatti: http://prapatti.com/
Sruti, itihAsas and kAvyaM
Rig Veda: rigveda.sanatana.in
Valmiki Ramayana: http://valmikiramayan.net/
Raghuvamsham: http://sanskritdocuments.org/sites/giirvaani/giirvaani/rv/intro_rv.htm
Ritusamhara: http://sanskritdocuments.org/sites/giirvaani/giirvaani/rs/rs_intro.htm
News
Sudharma: Samskrita Daily: https://sudharmasanskritdaily.in/
DD News/Vaartavali : https://ddnews.gov.in/shows/vaartavali
All India Radio: https://prasarbharati.gov.in/homepage-air/
Samprati Vartah: http://www.samprativartah.in/
Magazines
Sambhashana Sandesha Archives: http://www.sambhashanasandesha.in/php/volumes.php
Chandamama : https://archive.org/details/Chandamama_Sanskrit_1988
Samskritam Audios
Samskrit audios from Archive.org. Click here