HPCC Systems is a platform for working with big data that was originally developed by various companies before being acquired by RELX Group in 2004. It uses a C++ backend with Thor for data refining, Roxie for data delivery, and ESP as an enterprise service platform. Data is processed using the ECL declarative language. The HPCC Visualization Framework provides JavaScript visualizations for embedding in web apps with a consistent data interface and published properties for serialization. It supports various chart types for visualizing workunit and Roxie data from the HPCC Platform.