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We use https://github.com/KantaraInitiative/wg-uma for active spec development, with snapshots provided on the docs.kantarainitiative.org site.
The UMA technical specifications have reached Version 1.0 finalization and V1.0.1 draft specifications representing a "patch release" are out for review.
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The UMA Core V1.0.1
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Recommendation and the OAuth Resource Set Registration V1.0
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The following auxiliary documents are currently non-normative:
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.1 Recommendation are now available (check out the Release Notes too).
Obsolete specifications and auxiliary documents are collected under a separate page in this area.