The OIX Directory is the definitive list of participants in the Identity Ecosystem. It includes entries for Trust Frameworks and Schemes, and those who regulate these. It also provides listings of suppliers of identity services of all kinds: Identity Providers, Identity Technology Providers, Evidence Verifiers and organisational ID solution providers. Importantly it shows you who is certified to operate under which Trust Frameworks or Schemes, and what level and type of certification they have achieved.
OR you can drill down via the below categories within the directory.