Delhi Sultanate (Taru Dalmia) - Delhi-based reggae/hip-hop artist I recently came across.
Reggae India - new Delhi reggae collective: Abood, Priyanka Singh, Raghav Dang, and Zorawar Shukla
Samba - Nepali singer. Seems to do covers of English songs (sometimes with Nepali mixed in). But apparently only one professionally recorded song, "Get Up, Stand Up", with video.
Jayashri - I don't know very much about them, but they seem to be popular in Sri Lanka. Do they sing in Sinhala or Tamil (or both)? Austrian-based, I believe.
Apache Indian (Steven Kapur) - Well-known British-born Indian (Panjabi) reggae/ragga/bhangramuffin/bhangragga artist.
Asian Dub Foundation - Rap, dub, dancehall, electronica.