AccesoAbierto has made MELIBEA, a directory and validator of open access policies, available.
Here's an excerpt from the About page:
MELIBEA is a directory and validator of institutional open-access (OA) policies regarding scientific and academic work. As a directory, it describes the existing policies. As a validator, it subjects them to qualitative and quantitative analysis based on fulfilment of a set of indicators that reflect the bases of an institutional policy.
Based on the values assigned to a set of indicators, weighted according to their importance, the validator indicates a score and a percentage of fulfilment for each policy analyzed. The sum of weighted values of each indicator is converted to a percentage scale to give what we have called the "validated open-access percentage," calculated as explained in the Methodology section.