Inflation has become a well-accepted scheme for explaining the three large mysteries of big-bang cosmology: the observed homogeneity of the universe, its extreme flatness, and the nearly-scale-free power-spectrum of initial density perturbations. The study of models in which the inflation field(s) experience parametric resonance, a popular method for causing particle production and, thus, the resumption of the normal big-bang time line will be discussed. Several distinguishing observables have been investigated using a new C++ pseudo-spectral code named PSpectRE: first, the spectrum of gravitational radiation produced by each model has been calculated. In addition, many models tend to produce oscillons, a kind of long-lived but non-symmetry-protected soliton, and these can profoundly affect the evolution history of the universe prior to their
eventual decay. PSpectRE performs competitively and exhibits excellent energy conservation.

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