We have ported the CMBFAST package to the C++ programming language to produce CMBEASY, an object oriented code for the cosmic microwave background. The code is available at www.cmbeasy.org . We sketch the design of the new code, emphasizing the benefits of object orientation in cosmology, which allow for simple substitution of different cosmological models and gauges. Both gauge-invariant perturbations and quintessence support has been added to the code. For ease of use, as well as for instruction, a graphical user interface is available.
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