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Archipelago
Order entry and execution system for Nasdaq and listed stocks. Features include anonymous access to all displayed Nasdaq market participants, SmartBook TM proprietary execution algorithm.
Radical Corporation
Real time data, smart hunt and seek order routing. Alerts, filters, direct access to all exchanges and ECNs.
Online Forex Broker
Foreign Exchange Trading, information about Forex and Online Forex currency trading.
TrackECN
A division of Track Data Corp. Has trading technology that links to Nasdaq's SuperSOES.
Brut
Covers the Nasdaq market providing proprietary access to trading liquidity.