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All downloaded are available on GitHub. Please check the links below.

OPC UA (Multi-Platform, .NET Standard based)

DescriptionDownload
OPC UA .NET Standard
The OPC UA .NET Standard offers a fast and easy access to the OPC UA Client & OPC UA Server technology. Develop OPC compliant UA Clients & Server with C#/VB.NET targeting the .NET 4.6.2, .NET Standard 2.1 or .NET Core 3.1.
OPC UA .NET Standard

OPC DA/AE/HDA (Windows, .NET Standard based)

DescriptionDownload
OPC DA/AE/HDA Client .NET Standard
The OPC DA/AE/HDA Client .NET Standard offers a fast and easy access to the OPC Classic Client technology. Develop OPC compliant DA, AE and HDA Clients with C#/VB.NET for the .NET Standard 2.1 framework.
OPC DA/AE/HDA Client .NET on GitHub

OPC DA/AE (Windows, C++ based)

DescriptionDownload
OPC DA/AE Server C++
The OPC DA/AE Server SDK offers a fast and easy access to the OPC Data Access (DA) and OPC Alarms&Events (AE) technology.
OPC DA/AE Server C++ on GitHub