[1] The CSG™ [2] also provides statistics using a pie chart to graphically represent the percentage of different SSL Certificates [3] in use in the environment (for this to function correctly, the SSL Network Scanning facility must be enabled). This is valuable, high level, management information that can be used to how many SSL vendors currently supply your organisation and the impact if specific vendor relations were to be cancelled and replaced with the more dominant vendors.
Links:
[1] https://www.digi-sign.com/downloads/download.php?id=aacd-digi-ssl-pdf
[2] https://www.digi-sign.com/aacd/certificate+service+gateway
[3] https://www.digi-sign.com/ssl+certificate