HEATKEYS

Electronic components distributor Newark offers semiconductors, passives, interconnects, electromechanical, power source, specialty products, test and measurement equipment

Instructables is the Biggest How To and DIY community where people make and share inspiring, entertaining, and useful projects, recipes, and hacks.

NI leverages commercial technologies, such as industry-standard computers and the Internet, to deliver customer-defined automation, test and measurement hardware and software solutions for engineers and scientists.

Providing researchers with access to millions of scientific documents from journals, books, series, protocols and reference works.

Academia.edu helps academics follow the latest research.

MathWorks is the world’s leading developer of technical computing software for engineers and scientists in industry, government, and education

International Electronic Discussion Forum: EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals

Technical help for biomedical technicians specially in developing countries. A collection of service manuals, tutorials and descriptions of medical equipment.

IEEE Xplore. Delivering full text access to the world

Fogg System Company offers Transducer Interface and Adapter Cables as well as ECG, Pressure, Respiration and Temperature Simulators for use with Patient Monitors.