Modern research relies on software, and building upon—or reproducing—that research requires access to the full source code behind that software (Barnes, 2010; Morin et al., 2012; Ince et al., 2012; Prins et al. 2015; Lowndes et al., 2018). As Buckheit and Donoho put it, paraphrasing Jon Claerbout, ‘‘An article about a computational result is advertising, not scholarship. The actual scholarship is the full software environment, code and data, that produced the result’’ (Buckheit & Donoho, 1995). Open access to the source code of research software also helps improve the impact of the research (Vandewalle, 2012).