We present a new, free, and open source REPTATE (rheology of entangled polymers: toolkit for analysis of theory and experiment) software package for viewing, exchanging, and analyzing rheological and associated data. The main idea of REPTATE is to propose a powerful and user-friendly platform, which can be installed on the same computer as, e.g., the rheometer and which makes comparing experiments with classical, or latest, theories easy-without the need for a theoretician. The new REPTATE software offers full compatibility with different operating systems (Windows, Mac, and Linux). We demonstrate the use of REPTATE by reproducing predictions of recently published articles, from entangled, monodisperse, and polydisperse linear chains to branch-on-branch polymer systems in linear and nonlinear rheology regimes. (c) 2020 The Society of Rheology.