Research to develop a suite of software applications and libraries of phasor measurement units (PMUs) and synchrophasor data for power system planning, modeling, and analysis. The research and software development activities will be coordinated with industry partners and universities. All applications will be based on the common open platform concept, have a common data format structure, and be released under an open-source license. This work will address oscillation detection, frequency response, model validation and calibration, equipment misoperations, and other important power-grid-related issues.