Drivers

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

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

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

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

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

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/

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

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/

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

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

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

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

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/

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

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

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/

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

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

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

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

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

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

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/