6502.org: Information, links and projects for enthusiasts of the 6502 microprocessor. Includes documentation and source code archives and a discussion forum

AVR 8-Bit RISC: Official product information from Atmel Corp. Include overview, technical specifications, details of application support, and information about various associated tools and software

Jal: Just Another Language: Home of high-level imperative Algol-Pascal-like language for microcontrollers: Microchip PIC (16c84, 16f84, 12c508, 12c509, 16F877), Ubicom SX (SX18, SX28); developer list, platforms, downloads, news, support. SourceForge.net

OpenSPARC.net: Sun Microsystems initiative to create open source community and participation in processor architecture development; news, documents, analysis, downloads

Sun Microsystems, Inc.: UltraSPARC Processors: Microprocessors from Sun Microelectronics division. Wide range of powerful processors, can be directly incorporated into custom designs

The Western Design Center, Inc.: WDC: Develops, sells 65xx processor line: integrated circuits (chips), intellectual property (cores), development tools and boards, design kits, system level products; has documentation, online order/quotation request forms