Quite a number of open source software quality models exist today. These models emerged as a result of the need to measure quality in open source software, which is quite unlike closed source, or proprietary software. ISO 9126 standard forms the basis from which most of these models derive. However, ISO 9126 standard has been replaced by ISO 25010. Therefore, as research endeavors progress towards evolving the "silver bullet" open source software quality model, it is the aim of this paper to evaluate existing open source software quality models against the ISO 25010 standard. The findings from this study reveal a candidate model (from among the existing models) that can be leveraged in deriving a generic open source software quality model.