trader59, QuoteTracker is a full featured platform that can use various sources for quotes,
TD Ameritrade and eSignal included. For using Ameritrade quotes, you have to have an account with them. Whether you place trades with them or not is up to you.
QT lets you trade with multiple brokers from the same interface, so potentially, you could get quotes from Ameritrade and trade with Ameritrade, IB, RML, or any other broker that is supported for trading in QT, or place the trades through the broker's native interface.