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Galaxies are thought to reside inside of large gravitationally boundstructures of dark matter, so-called haloes. While the smallest of these haloeshost no or only a few stars, the biggest host entire clusters of galaxies. Overcosmic history, haloes often collided and merged, forming bigger and biggerstructures. Merger trees, i.e., catalogues of haloes evolving and connectionsbetween them as they grow and merge, have become a vital tool in describing andunderstanding the history of cosmological objects such as our Galaxy.Semi-analytical models, built on top of such merger trees, are a commonapproach for theoretical studies in cosmology. The semi-analytical nature ofsuch models is especially beneficial when the dynamic range in spatial and timescales that need to be considered becomes too large for numerical simulations.Ancient Stars and Local Observables by Tracing Halos (A-SLOTH) is such asemi-analytical model and it is designed to simulate star formation in theearly Universe in a fast and accessible way. It uses merger trees, either fromnumerical simulations or generated by statistical algorithms to describe thehistory of galaxies. The processes of baryonic physics, in particular gascooling, star formation and stellar feedback are described with approximationsand statistical models. The range of applications for this model is extensiveand we, therefore, make it available to the scientific community.

A-SLOTH: Ancient Stars and Local Observables by Tracing Halos