The CIM-EARTH Framework (Community Integrated Model for Energy and Resource Trajectories for Humankind) is an environment for economic modeling and simulation. The project's goal is to provide open source modeling tools that incorporate the most modern computational methods, to increase both the quality and transparency of integrated assessment modeling.

The AMPL-Source CIM-EARTH Framework (ASCEF) is a first prototype version of the CIM-EARTH framework. ASCEF is written in AMPL, a modeling language that requires licenses to install and solve problems of realistic sizes. To facilitate adoption and the integration of advanced data processing and analysis services, we launched an effort to move the implementation from AMPL to C++ and to adopt standard input and output formats. The result is what we call the Open-Source CIM-EARTH Framework (OSCEF).