Currenex
Connects more than 70 global banks to a superior electronic trading network, making Currenex one of the deepest liquidity pools in forex.
http://www.currenex.com

EFX Group - Forex Trading
Route orders directly to liquidity pools of major banks through STP and offer the ability to cross orders anonymously in internal order book via direct access ECN technology.
http://www.efxgroup.com/

Fx Solutions
Currency trading in the major pairs and the crosses, live demo and flash tutorial
http://www.fxsol.com/

Gain Capital
Independent provider of online currency trading on the major pairs
http://www.gaincapital.com/

HotspotFXi - Institutional Foreign Exchange
Bank services and institutional investor services.
http://www.hotspotfxi.com/

Interactive Brokers - Direct Acces Online Trading
Industry's premier direct access trading platform offer low commissions, best price execution, high credit interest, and low margin interest rates.
http://www.interactivebrokers.com

Marketiva
With more than 2.5 million live orders executed each month, Marketiva is one of the most popular over-the-counter market makers in the world
http://www.marketiva.com/

Oanda
Advanced and comprehensive provider of foreign exchange, currency trading, and information services.
http://www.oanda.com/

Saxo Bank
Online trading in spot, forward and options and quotes, charts, news, analysis.
http://www.saxobank.com/