An exchange based in Slovenia, where users can trade between Bitcoins and US Dollars. The Bitstamp API provides public market data and private trading access.
Kraken is a bitcoin exchange with a growing EUR market. Kraken also support other cryptocurrencies..
ANX provides an easy, secure, and affordable marketplace for you to buy and sell Bitcoins. Incorporated in Hong Kong.
BTC-e.com serves as a platform for individuals interested in buying and selling Bitcoins using an assortment of world currencies.
Blockchain highly recommends Bitpay - The World Leader in Bitcoin Business Solutions. Bitpay offers a complete checkout solution for including automatic conversion to local currencies and integration with a host of shopping cart software.