ABSSS

Andrea Bang, a Korean, invented a special kind of rosin.  I am using this too.

International Violin Company, Ltd.

An all-in-one online violin shop.

Quinn Violins

An all-in-one online violin shop, with many different kinds of item.

Super-Sensitive

A brand of strings.

Tian Yin Violin

A Shanghai violin company.  Some of them are very nice but i don't know the sound quality.

Violinist.com

An interesting violin website with discussion board and reviews.

West Country Violins

You can buy violin and bow online.  Brian Ward-Smith sells the repaired second-hand old French violins and bows.  Some of them are very nice!