A computer-implemented method is provided for permitting a user to manipulate data feeds via a graphical user interface. The method includes receiving, by a computing device, the data feeds over a communications network in real time from corresponding data sources and receiving from the user, by the computing device, via the graphical user interface an execution plan comprising a list of one or more actions to be performed on the data feeds. The method also includes sequentially executing, by the computing device, each of the actions in the execution plan on the real-time data feeds to generate one or more manipulated data feeds. The method further includes displaying, by the computing device, the manipulated data feeds to the user in a user-defined format via the graphical user interface.