Penguin Client Library
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It links customer applications to RadioLinx radios.
OPC Client for testing and troubleshooting of any standard OPC Server.
Provides the standard interface for accessing data from OPC clients.
Designed for all local or remote OPC Clients such as HMI, SCADA.
RabbitMQ .NET client is an implementation of an AMQP client library for C#.
An OPC Client packed for testing and troubleshooting OPC servers & connections.
The OPC Simulator Server provides any OPC Client application with simulated COM.
It is a program that can be used to publish the OPC tags to an OPC Client.
The Easylon OPC Server enables any OPC Client to access the LonWorks network.
H2O Dotnet Library is a .NET version of H2O web service client library.
MySQL Connector/C is a C client library for client-server communication.
Data Layers Ltd.
The most versatile productivity toolkit for OPC client developers.
Kepware Technologies, Inc.
ClientAce provides tools for those wanting to build an OPC client application.
Oxalis is a visualization module working as a HDA OPC client.
SphinxConnector.NET is an all managed .NET client library.