Drivers

NTPort Library - Enables real-time direct access to PC I/O ports. By Zeal SoftStudio. [Shareware]
http://www.zealsoftstudio.com/ntport/

Unified IO - C++ interface for industrial IO cards. An alternative to device drivers provided by hardware vendors.
http://www.bbdsoft.com/interface.html

MemAccess Library - Gives programmers control of hardware devices from Win32 application without using the Windows Drivers Development Kit (DDK). It allows real-time direct access to memory mapped I/O. By Zeal SoftStudio. [Shareware]
http://www.zealsoftstudio.com/memaccess/

Modular Systems - Development of device drivers for Windows, system software and .NET applications.
http://www.modularsystems.dk

NT Kernel Resources - Windows Packet Filter Kit for developing filtering/modifying communication applications. Also Windows 2000 undocumented kernel structures. Open source TDI firewall.
http://www.ntkernel.com/

Sybera - Toolkits, custom development, and training for Windows kernel driver development. Content in German and English.
http://www.sybera.de/

Kernel Drivers - Offers design, implementation and testing custom Windows filesystem and device drivers.
http://www.kerneldrivers.com/

TVicHW32 - A toolkits for real-time direct access to port I/O, physical memory, hardware interrupts from a Win32 application. [Shareware]
http://www.entechtaiwan.com/dev/index.shtm

Intelligraphics - Device driver development including display, audio, communications, digital imaging, telecom, and embedded systems software.
http://www.intelligraphics.com/

Beyond Logic - Includes detailed information on USB, serial ports (RS-232), parallel ports (SPP/ECP/EPP/IEEE1284) and device drivers.
http://www.beyondlogic.org/

Device Driver Development Resources - A list of selected sites, news groups and tools to help locate additional device driver resources and development tools. List also includes hardware and software resources for the target side development and for embedded systems.
http://www.jungo.com/resource_index.html

USB Analyzer - A professional software-based analyzer for USB driver developers. It captures and analyzes I/O requests for all USB devices. Targets Windows platforms and USB 2.0 and 1.x.
http://www.sourcequest.com/

Matrikon OPC - Real-time process drivers for plant systems, including OPC clients and servers, as well as driver utilities, development tools, educational resources, and training and support services.
http://www.matrikonopc.com/

Concepts Systems - Windows Device Driver, Linux Kernel Programming training.
http://www.conceptsinc.s5.com/

VGAdoc - Programming information for every RAMDAC, EGA, VGA, SVGA, and VESA video card made up to 1995.
http://home.worldonline.dk/finth/

IOGateway - An ActiveX Control package providing a unified interface to a variety of interface boards from different manufacturers. The purpose is to simplify project development for data acquisition and control.
http://www.industrialmightandlogic.com/

OSR Online - Device driver development information, DDK online.
http://www.osronline.com

I/O Communications module - Provides access to devices on a PCs serial and parallel port. (trial version)
http://www.jspayne.com/io/io.html

Direct Device Programming Links - Links to information about programming device drivers.
http://www.geocities.com/SiliconValley/Peaks/8600/device.html

2d3D, Inc. - Device driver and embedded development.
http://www.2d3d.com/

User CONfigurable Driver (UCON) - Enables to quickly and easily develop communications drivers for any serial device or ethernet device. Designed as a driver plug-in, UCON is completely integrated with OPC server KEPServerEX. By Kepware Technologies.
http://www.kepware.com/Products/products_UCON.html

Jungo - Provides WinDriver and KernelDriver, device driver development tools, for Windows,Linux,Solaris.
http://www.jungo.com/

VMWare's Back - Virtual Disk drivers for Windows to support VMWare
http://chitchat.at.infoseek.co.jp/vmware/index.html

Hill Engineering Consulting - Specializes in the design and development of Windows, Linux and DOS device drivers and real time firmware.
http://www.hill-eng.com/

Harte Technologies - Specializes in developing kernel-mode drivers for Windows NT, 2000, XP, including WDM, USB, and NDIS drivers.
http://www.hartetechnologies.com/

BSQUARE - Tools to build device drivers for Microsoft Windows operating systems.
http://www.bsquare.com/