Quote from originalskunk:
OpenTick supply adapters for use with WealthLab, QuantDeveloper and AmiBroker. It is also supported by NinjaTrader, EclipseTrader, Ccapi2, tymoraPRO, multicharts, Sierra Chart, Right Edge. There are also open source bindings available for C++, .NET, Perl, Java, Delphi and COM.
The data feed is currently free -- although you are obviously required to pay exchange fees for real time data from whatever exchanges you need. Free means that technical support can be spotty at times. Only US exchanges are currently supported.
Sign up and try it. You might be surprised. esignal and iqfeed are probably very, very nervous.