Eclipse Milo
Milo is an open-source implementation of OPC UA. It includes a high-performance stack (channels, serialization, data structures, security) as well as client and server SDKs built on top of the stack.
Stack Overflow tag: milo
Mailing list: https://dev.eclipse.org/mailman/listinfo/milo-dev
Maven
Building Milo
Using JDK 8, run mvn clean install from the project root.
Releases
Releases are published to Maven Central and snapshots to Sonatype.
OPC UA Client SDK
<dependency>
    <groupId>org.eclipse.milo</groupId>
    <artifactId>sdk-client</artifactId>
    <version>0.5.3</version>
</dependency> 
OPC UA Server SDK
<dependency>
    <groupId>org.eclipse.milo</groupId>
    <artifactId>sdk-server</artifactId>
    <version>0.5.3</version>
</dependency> 
Referencing a SNAPSHOT release requires the Sonatype snapshot repository be added to your pom file:
<repository>
    <id>oss-sonatype</id>
    <name>oss-sonatype</name>
    <url>https://oss.sonatype.org/content/repositories/snapshots/</url>
</repository> 
Public Demo Server
An internet-facing demo server is accessible at opc.tcp://milo.digitalpetri.com:62541/milo.
It accepts both unsecured and secured connections. Before connecting with security you must upload your client's DER-encoded X509 certificate using the form at http://milo.digitalpetri.com.
Authenticate anonymously or with one of the following credential pairs:
- user1/- password
- user2/- password
- admin/- password
The code powering the demo server is available here: https://github.com/digitalpetri/opc-ua-demo-server
 JarCasting
 JarCasting