» Department of Official Language
Official site under the Ministry of home affairs covers the language act, language rules, departmental activities and related resources.
http://rajbhasha.nic.in/
» Dictionaries
A collection of freely downloadable dictionaries between several of the principal languages. From IIIT, Hyderabad.
http://ltrc.iiit.net/onlineServices/Dictionaries/Dict_Frame.html
» Ethnologue: Languages of the World
List of languages of India and the geographical areas where it is spoken.
http://www.ethnologue.com/show_country.asp?name=India
» Indian Language Alphabet Comparison Page
Eden Golshani's website - charts showing all the letters of the Hindi, Punjabi, Bengali, and Gujarati syllabaries.
http://www.ukindia.com/zalph.htm
» Language Journal
Monthly online journal devoted to the study of the languages spoken in the Indian sub-continent.
http://www.languageinindia.com/