PoWR (Potsdam Wolf-Rayet Models) calculates synthetic spectra for Wolf-Rayet and OB stars from model atmospheres which account for Non-LTE, spherical expansion and metal line blanketing. The model data is provided through a web interface and includes Spectral Energy Distribution, line spectrum in high resolution for different wavelength bands, and atmosphere stratification. For Wolf-Rayet stars of the nitrogen subclass, there are grids of hydrogen-free models and of models with a specified mass fraction of hydrogen. The iron-group and total CNO mass fractions correspond to the metallicity of the Galaxy, the Large Magellanic Cloud, or the Small Magellanic Cloud, respectively. The source code is available as a tarball on the same web interface.

pyStarburst99 is a Python version of the Starburst99 (ascl:1104.003) population synthesis code for star-forming galaxies. This Python version includes new evolutionary tracks and synthetic spectral energy distributions. pyStarburst99 provides wider coverage in metallicity, mass, and resolution, and includes evolutionary and spectral models of stars up to 300–500 M⊙.