A toolkits for real-time direct access to port I/O, physical memory, hardware interrupts from a Win32 application. [Shareware] http://www.entechtaiwan.com/tools.htm
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/
Windows Packet Filter Kit for developing filtering/modifying communication applications. Also Windows 2000 undocumented kernel structures. Open source TDI firewall. http://www.ntkernel.com/