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⊙.

spinOS calculates binary orbital elements. Given a set of radial velocity measurements of a spectroscopic binary and/or relative position measurement of an astrometric binary, spinOS fits an orbital model by minimizing a chi squared metric. These routines are neatly packaged in a graphical user interface, developed using tkinter, facilitating use. Minimization is achieved by default using a Levenberg-Marquardt algorithm from lmfit [ascl:1606.014]. A Markov Chain Monte Carlo option is available to sample the posterior probability distribution in order to estimate errors on the orbital elements.