Opencores.org Seeks to design and publish core designs under a license for hardware modelled on the Lesser General Public License (LGPL) for software.
Hamburg VHDL Archive Provides a collection of free, public-domain or shareware, VHDL documentation, models, and tools.
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.
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.