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Enhancements to the infrasound software tool kit, InfraMAp, have been integrated in three main areas: propagation modeling, environmental variability modeling, and stochastic localization techniques. All new model functionality is included in a next-generation release of the tool kit. The modeling advances improve propagation predictions and understanding of environmental effects, and they have been used to evaluate the localization performance and confidence bounds of operational infrasonic networks. New propagation modeling features include a high altitude, low frequency absorption model, a synthetic waveform generator from ray tracing, and an improved Parabolic Equation (PE) propagation algorithm. In environmental variability, a range-dependent spectral gravity wave model has been developed that generates wind perturbation fields for use in evaluating propagation variability. Finally, regional infrasound networks can be defined and used to compute source localizations and associated areas of uncertainty, based upon both measurement data and modeling results.