1. IPC -The Association Connecting Electronics Industries. They set the standards we manufacture to.
2. CadSoft - offers solutions for PCB design, including Schematic Capture, Board Layout, and Autorouter.
3. SMTnet - provide the most efficient and effective two-way exchange between providers and users of the products, services, and information related to electronics manufacturing.
4. Electronics Lab- useful circuits with full description, diagrams and PCB, electronics articles, links and downloads.
5. PCBLibraries - Land pattern calculators/tools/libraries, other resources, online forums.
6. PCB007 – real-time magazine providing PCB informations for readers around the world.
7. CAM350 is designed and owned by DownStream Technologies. You can even get a limited version for free!
8. SMTA -Surface Mount Technology Association (SMTA) is an international network of professionals who build skills, share practical experience and develop solutions in electronic assembly technologies.