I suggest few general but popular websites to you.

http://Raaga.com (for a strong database)

http://coolgoose.com (Search Raga in categories, I also played a raga there as "Ahirbhairava" on Guitar

My own website (www.guitarmonk.com) - It will give you some guitar links and music. I am soon coming with a database

http://desimusic.com (You may listen to an instrumental section here)

------Give me some time, I will bring more as not getting their names at this moment ------