This page gathers information about implementation efforts and interest, along with interoperability testing plans. Maciej Machulak is the UMA group's implementation coordinator. Key implementations are noted below, in alphabetical order of the project or organization.
We undertook a bounty program in 2010 that facilitated the creation of test cases. See the Interoperability Testing page for details of the "UMA1" interop event and activities. That page may have a more up-to-date list of implementations than this page.
Cloud Identity Limited
The Cloud Identity Limited company (also at @CloudIdentityUK) offers a commercial UMA Authorization Server that implements the full UMA protocol. The company also offers Software Development Kits (SDKs) in Java and Python programming languages. More information can be found on the company's website and the company's YouTube channel. The company has integrated UMA with its Connect service to simplify the flow for Host and Requester applications.
Fraunhofer AISEC project
This Java implementation has been contributed to Apache Amber. Developer documentation is available. Update from the team as of 9 Jul 2012: "UMA client, AM, and Host are running now within AISEC domain and will be accessible from the outside after receiving the security clearance from our network team".
The company Gluu (also at @GluuFederation) hosts the OXAuth open-source project, to which it has contributed an UMA component. The main use case for this implementation is enterprise usage. See the Enterprise UMA case study, Gluu's UMA page, and its YouTube channel for more info. Gluu has also proposed an "OX UMA claim profile"; for more information, see the Third-Party Profiles page.
This Java implementation includes an UMA/j framework and sample applications. See the SMART blog. The OAuth portion, originally named leeloo, has been contributed to Apache Amber (now Apache Oltu, which is going to include OpenID Connect and good JWT support too). Part the SMART project involves development of set of open-source Python libraries, called Puma, for UMA-enabling web apps to become UMA resource servers and clients. The SMARTAM.net authorization server is a running AS that third-party resource servers and clients can interact with if they wish.