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spark, spark-viewer and spark-docs are free & open source.

spark was originally a fork of the excellent WarmRoast profiler by sk89q. The project would not exist if it wasn't for the work originally completed there.

The spark-viewer user interface is based on the original WarmRoast UI, with a number of changes and improvements made over the years. The most significant of which was a re-write using the React framework, contributed by astei.

And finally, thanks to all the other contributors to spark, spark-viewer and spark-docs who have made pull requests on GitHub.