We do have a bunch of threads where some of us have at least posted language-specific resources we find useful, but we don't have a generic thread for useful resources. I was just looking over at the "useful links" thread on French forum and thought maybe we could start something like that here, too. However, I thought we could make it for all South Asian languages rather than any particular language especially since there are resources that include information in multiple such languages.
I guess I'll start out with this as a small list. I didn't realize just how many great resources have already been listed in this forum until I started looking!
https://dsal.uchicago.edu/dictionaries/ - online (if rather old) dictionaries for several South Asian languages
https://www.dkagencies.com/ - online bookstore with resources for learning various Indian languages
https://www.kapruka.com/dictionary/EnglishToSinhala.jsp - English-Tamil-Sinhala dictionary
https://malayalam.la.utexas.edu/resources/textbooks/ - Malayalam: A University Course and Reference Grammar available for free with audio
https://lucian.uchicago.edu/blogs/malayalam/ - videos in Malayalam for students
https://www.youtube.com/channel/UCsKnxn ... fNw/videos - YouTube channel with a few videos for learning a few phrases in Malayalam
https://www.youtube.com/c/LearnMalayalamwithEliKutty - Elikutty's YouTube channel for learning Malayalam
A few more videos for learning Malayalam:
https://www.youtube.com/watch?v=vdImOuYpnqU
http://www.thetamillanguage.com/les.html - Tamil Language in Context
http://www.tamilvu.org/ - rich site with many lessons for learning Tamil
http://www.learntamil.com/ - another resource for learning Tamil
http://www.kidsone.in/tamil/ - kids' resource for learning Tamil
http://ccat.sas.upenn.edu/plc/tamilweb/ - yet another online resource for learning Tamil
https://archive.org/details/progressivegramm00ardeiala - A progressive grammar of Tamil, courtesy of archive.org
http://web.archive.org/web/200710050505 ... p/ztm1.htm - archived version of ukindia's resource for learning Tamil script
http://omniglot.com/writing/tamil.htm - Omniglot's resource on the Tamil script
https://www.amazon.com/Reference-Gramma ... 927&sr=1-1 - Tamil grammar available on Amazon
https://www.youtube.com/user/desidame4eva#p/u - YouTube channel for learning Tamil
http://www.noolagam.com/ - resource for kids learning(?) Tamil
https://kannadakalike.org/ - good resource for learning Kannada
http://ccat.sas.upenn.edu/plc/kannada/ - six lessons for Kannada; transcription does not always match script
https://www.youtube.com/channel/UCirKrU ... twEWCObTbw - a YouTube channel for learning Kannada
Two YouTube video series for learning Kannada:
https://www.youtube.com/watch?v=maa6_dQp-Ms
https://www.youtube.com/watch?v=gOdlM3yaxnk
https://archive.org/details/grammaroftululan00briguoft - A Grammar of the Tulu Language
Video series for learning Tulu:
https://www.youtube.com/watch?v=z4bHwdYeDSI
https://www.youtube.com/watch?v=cVE92KCoDSc
http://www.koshur.org/courses.html - a useful website for learning Kashmiri
https://koausa.org/site/ - Kashmiri news site
http://www.kashmirilanguage.com/ - resources for Kashmiri including books and songs