MatrikonOPC is the world's largest developer and supplier of OPC drivers, clients, applications, tools and utilities. Not to mention, they are also the world's largest training facility for OPC technology. For integrators, developers and others using OPC, Download MatrikonOPC Explorer (a FREE utility used to help test and troubleshoot OPC servers and connections). Download FREE and most Popular MatrikonOPC Simulation Server in Automation & Control Community.

Kepware Technologies delivers industrial communication products that are known worldwide for their quality and reliability. The Company’s dedicated focus on OPC server technology allows Kepware Technologies to provide ensured compatibility combined with unparalleled reliability and ease of use. And with the breadth of over 90 of the most commonly used communication protocols available, Kepware Technologies continues to deliver a single consistent solution for the OPC connectivity needs of the industrial automation market. Download FREE KEPServerEx OPC Server (2 hour demo mode), OPC Quick Client, LinkMaster.

OPCTechs offers 60+ Windows/WinCE OPC servers which cover more than 30 PLC brands and over 500 model CPUs to support their dealer at a start. By the end of 2008, they will have 80+ OPC servers available to the market which represents 90% of coverage in the market. Please download the 2 hours free demo software.

FREE Tools from Advol; Many valuable clients, servers and OPC utilities can be downloaded free of charge in product evaluation packages.

HDA OPC compatible client which is compatible with most HDA OPC servers. Check FREE 30 minutes demo version.

Download FREE demo version of OPCcalc: Calculation Engine for OPC. OPCcalc™ is a vendor-neutral, process calculation framework for OPC data. OPCcalc allows you to easily create process calculations that use OPC tags as equation inputs and outputs. Based on Microsoft® Visual Basic.Net, OPCcalc handles all of the "plumbing" for your equations, letting you concentrate on your calculation logic. OPCcalc brings unmatched performance and features to OPC-based calculations.

Download FREE demo version TopView® OPC: Process Alarming, Notification and Remote Monitoring. TopView can monitor thousands of tags for user-configured alarm conditions, sending alarm notification messages through email, pagers and cellular phones. TopView supports voice annunciation and text-to-speech technology allowing delivery of audible alarm messages over any phone or through the computer's speakers.

Industrial DOT NET is a provider of .NET client assemblies for OPC including a FREE Quick Data OPC browser. FREE trial developer’s downloads with examples.

They offer FREE trial versions of every product, these trial versions are FULLY functional, limited by a warning message only. Kassl GmbH provides OPC client development toolkits for Delphi, Kylix, C++ and .Net as well as OPC utilities, OPC gateways and a toolkit to create OPC simulation servers.

A founding member of the OPC Foundation, National Instruments is committed to leading the development of state-of-the-art technology and open industry-standards such as OPC that improve your productivity. That's why they helped develop the OPC standards based on the The Microsoft .NET Framework. Check out their FREE Server Explorer and lot more.

NAUTSILUS offers FREE OPC Client/OPC Utility ExlinkDCS with functions OPC-OPC-, OPC-QNX-Linux-, and OPC-HTTP gateways, Data Server, and OPC Client. You can also FREE download QNX/Linux compatible OPC-TCP Toolkit, which allows you to develop a communication program providing link between a MS Windows-based OPC-Server and a custom QNX/Linux-based application.

They provide simple OPC server and client solutions, as well as more powerful predictive maintenance, data acquisition and vibration monitoring systems employing OPC on wired and WiFi networks.

Softing is a world-renowned provider of robust OPC toolkits that allow software developers to integrate OPC functionality seamlessly into their offerings. Softing has also developed OPC products for end-users that makes it easy for them to deploy OPC technology in their plants. All of Softing's software products are available in fully-functional downloadable FREE Demo versions.

They provide Developer Toolkits for OPC Servers and Clients which support Data Access, Alarms/Events, and Historical Data Access according to the latest OPC Specifications. These toolkits are implemented as Windows libraries and are compatible with any development system that can call into a DLL, (including those running under the .NET environment). Each toolkit is available as a Fully functional FREE demo that may be downloaded.

FREE Evaluation version of an OPC server package supporting Siemens PLCs and MODBUS TCP devices.

The Netlistener OPC-Server is a convenient network monitoring tool. It provides status data on network devices through ICMP, SNMP. The server allows supervising device processes (watchdog) and provides the operator with the CPU load data as an OPC variable. In addition it shows the CPU load of the host computer. Download FREE trial versons.

Several out-of-the-box OPC software products, including an OPC client & server framework for Borland Delphi & C++Builder, which can be downloaded and evaluated FREE of charge.

The OPC Solutions from Technosoftware supports a wide range of operating systems like Windows, Windows CE.net, .NET, Linux, Sun SOLARIS and even QNX 6.3. With this Technosoftware shows its competence in software solutions and services for a wide range of operating systems. Technosoftware is also the only supplier of DCOM based OPC Data Access and Alarms & Events Server and Client Solutions for Linux and Sun SOLARIS based systems. Fully functional FREE evaluation versions are available for download.

Integration Objects is a world-leading digital company for industry 4.0 & digital transformation advanced solutions. Integration Objects' OPC Servers software enable end users to seamlessly interface with databases and historians in order to access real-time and historical data. These OPC Server software are based on open industry standards and thus facilitate systems interoperability, data availability and reliability Our OPC Server software are available for download and free trial purposes.

Kontron czech offers OPC Servers that support 100's of PLC model types on the market. Choose the right OPC Server for you, download the FREE trial version and test it on your system.

U.C.ME-OPC is a leading alarm notification and alarm analysis software. It connects to any OPC server, DDE server or SCADA/HMI that supports OPC or DDE server functionality. Alarms may be sent via SMS(using cellular modems, TAP protocols and more), Email, Voice over telephony, WAP, RSS, Fax, Multimedia and more. U.C.ME is not just alarm notification for control systems. Download FREE demo Client.

Download a FREE fully functional version of OPCFailover to improve your OPC Clients access to the Process Data it needs. OPCFailover provides a unique, OPC redundancy capability that does not employ the traditional OPC proxy server in between the OPC Client and OPC Server. This application is independent of all OPC interfaces, is vendor neutral and is licensed for unlimited use on a node.

The iOPC .Net component requires the 2.0 Framework, and a development IDE (Visual Studio 2005 or later, or Sharp Develop.) It is not a full OPC standard implementation, as it only supports synchronous reads and writes, and only supports the writing of individual tags (although block reads are supported.) Released basically license free.... Download and test now.