Hamburg VHDL Archive - Provides a collection of free, public-domain or shareware, VHDL documentation, models, and tools.
Linux Today - Richard Stallman's thoughts on free hardware.
SystemC - Broadly supported C++ open source language and simulation kernel for modeling and implementing electronic systems.
OpenCollector Database - Site has a searchable index of many designs, tools and manufacturers.
Writings on Open Source Hardware - A collection of links to writings on themes related to Open Source Hardware like definitions, libraries, talks and conferences.
Art Interface Device - The Art Interface Device (AID) is a microprocessor platform for building electronic installation art. It can also be used as an interface between such artworks and computers. It will enable the artworks to respond to people and the physical environment.
ThinkCycle: Open Collaborative Design - Non-profit initiative that supports open source development and hosts a public repository of engineering design innovations in critical problem domains, such as low-power devices and portable health-care solutions for rural settings.
PalmBot - A site that documents what you need to build your Palm based robot.
Ethernut - Embedded Ethernet board equipped with an Atmel ATmega128 CPU and a Realtek RTL8019AS or LAN91C111 Ethernet controller.
Manticore - Formerly called "The HULK", Manticore is an open source hardware design for a 3D graphics accelerator. It is written entirely in VHDL.
Midi for the Pilot - How to build a midi interface for the palm pilot.
ARM Developments - Embedded system based on ATMEL AT91M40800 processor and Network Card based on Crystal CS8900A.
Ronja (Reasonable Optical Near Joint Access) - Optical point-to-point data link.
Bootloader for Microchip PIC USB Microcontroller - Bootloader updates firmware through HID interface – use of generic Windows drivers. XTEA encryption for firmware protection.
DAISY - Aims to make VLIW and other novel ILP architectures hundred percent compatible with popular existing architectures such as PowerPC, x86, and S/390, as well as the Java Virtual Machine.