Pysces is the Python Simulator of Cellular Systems. For a network of coupled reactions it does a stoichiometric matrix analysis, calculates the time course and steady state, and does a complete control analysis.
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Brett G. Olivier, Johann M. Rohwer and Jan-Hendrik S. Hofmeyr
Modelling cellular systems with PySCeS
Bioinformatics (2005) 21 (4): 560-561.