- Foundation Design
 - San Francisco - Offering mechanical engineering, Pro/ENGINEER surfacing, and prototypes; product design from concept to manufacture. - Function Engineering, Inc.
- Palo Alto - Mechanical engineering services, specialising in mechanism development, product development, and engineering analysis.
- IDEO
- San Francisco - Multidisciplinary product design firm.
- Innodesign Inc.
- Palo Alto - Provides consulting and new product development.
- Insight Product Development, LLC
- Los Gatos - Offers research, mechanical engineering, prototyping, and interface and industrial design services.
- Lunar Design
- San Francisco - Offers industrial design, design strategy, graphics, branding, imaging, and mechanical engineering services.
- Marpo Design
- Livermore - Offers a variety of services with an emphasis on mechanical engineering and industrial design.
- MOTO Development Group, Inc.
- San Francisco - Design and engineering group committed to delivering products.
- nexform
- Oakland - Combining design and technology for new forms and function.
- Osterhout Design Group
- San Francisco - High-Tech Toy Development and Consumer Products Design.
- Praxis Product Design
- Emeryville - Provides research, design, and engineering for user centred, value driven, and profit generating products.
- Schmoll Design
- San Francisco - Specialises in designing injection-moulded plastic products.
- SK Communications, Inc.
- Sunnyvale - Product design firm specialising in electronic products.
- SomeSortOf.com
- Silicon Valley - Providing mechanical, electrical, and regulatory engineering design services for all stages of product development.
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