Spark API SDK is an open-source, lesser GPL-licensed .NET library that supports access to the financial market data API from Spark (http://iguana2.com/spark-sdk).
The SDK comprises an open-source C# code base with detailed examples and comments on how to interface with the Spark API and process the data streams. This is encapsulated in the SparkAPI project which contains all the classes and helper functions required to easily utilise the API. A set of sample applications demonstrating some simple uses of the API are also available.
The component also supports replay from historical files and does not require a connection to the Spark servers when working in file replay mode. This makes it ideal for those wishing to learn how to manipulate and utilise institutional-grade market data in non-institutional setting.
Spark is a market data provider that supplies real-time exchange grade data feeds for Australian and New Zealand equity and options markets
Wow, this SDK was exactly what I was looking for. It's uncanny. Admittedly I wrote it. But it's still fantastic.