This page gathers information about implementation efforts and interest, along with interoperability testing plans. Maciej Machulak is the UMA group's implementation coordinator. Key existing implementations that we know about are noted below, in alphabetical order of the project or organization.
Roland Hedberg is developing a test suite based on his OpenID Connect test suite. (See the Interoperability Testing page for more details of the "UMA1" interop event and activities, including implementations that are participated in interop about interop testing.)
Cloud Identity Limited implementations
This Java open-source community project is hosted by ForgeRock. It has not yet released code publicly.