OpenFlux2 is an extended version of OpenFLUX (https://sourceforge.net/projects/openflux/) - the modern MATLAB-based modelling software for 13C flux analysis (MFA). The following features were implemented in OpenFLUX2, which were not present in original software: integrated support for calculation and analysis of parallel labeling experiments (PLE), extended statistical analysis of parameter estimation results, calculation of fluxes and measurements correlation, structural identifiability...