ASCEND 
ASCEND is an open source modelling environment and solver for large or small systems of non-linear equations, for use in engineering, thermodynamics, chemistry, physics, mathematics and biology. Solvers for both steady and dynamic (NLA & DAE) problems, are provided. It offers:
- An object-oriented model description language for describing your system,
- An interactive user interface that allows you to solve your model and explore the effect of changing the model parameters, and
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