IBM UDDI4J
A Java class library that provides an API to interact with a UDDI registry. By IBM.
jUDDI.org
An open source Java-based implementation of a UDDI registry and a toolkit for implementing access to UDDI registries within applications. By Bowstreet, Inc.
Microsoft UDDI SDK
Provides tools required for developer to interact with a UDDI registry. By Microsoft.
Systinet WASP UDDI
A secure, platform-independent UDDI registry implementation.
UDDI 2.0 in Java
A reference implementation of the UDDI specification. With this UDDI Registry, Web services developers can publish and test their applications in a secure, private environment for their own applications.