Open Source Soft Microprocessors - http://www.ddj.com/linux-open-source/197800817/ Free licensing of soft microprocessors lets designers easily modify FPGAs and gives greater visibility into architectures; explains implications of associated licensing models. Dr. Dobb's.
The Freedom CPU - http://f-cpu.seul.org/ F-CPU, mainly dedicated to pure SIMD superpipelined 64-bit RISC CPU, and the sources. Open Source, GPL.
CMOSexod.com - http://www.cmosexod.com/ For advanced hobbyists: share free microprocessor and DSP IP cores written in Verilog or VHDL.
Zet Processor - http://zet.aluzina.org/ An open implementation of IA-32 architecture which is also called x86. Includes documentation, screen shots and a forum.
STM - http://www.asahi-net.or.jp/~uf8e-itu/ 32-bit, 2-way superscalar RISC processor, designed in a HDL. Source downloads. This one is actually working.
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