NOBLEFIT is a flexible Matlab/GNU Octave toolbox for quantitative interpretation of (aqueous) tracers in terms of environmental processes and models (e.g., dissolved noble gases, other atmospheric gases, or just about anything else that deserves quantitative model-based interpretation).
In contrast to similar tools where the possible tracers and models are hard-wired into the code, NOBLEFIT is designed to allow the user to define his own tracers and models.