| RTD USA | | PC104 and PC104-Plus single board computers, modules and systems. |
| SBS Technologies, Inc. | | Building embedded computer solutions for telecommunications, aerospace, and industrial automation. |
| Sensoray Company | | Designs, manufactures, and sells interface electronics for industrial computers. Specializes in plug-in adapter boards for data acquisition, video image capture, machine control and communications. |
| Si Solutions | | Single board computer manufacturer providing advance products for embedded OEM's. |
| Signalogic | | DSP development tools and PC-based OEM products, including software, hardware, PC104, embedded and real-time systems and data acquisition. |
| Signum Systems Corp. | | Tools for embedded systems development, in-circuit emulators, debuggers and compilers. |
| Silicon Laboratories Inc. | | Semiconductor company specializing in the design, manufacturing, and marketing of mixed-signal integrated circuits (ICs). |
| SiriusmicroSystems | | Specializes in development systems, programmers and training tools for the Microchip PICmicro family of embedded microcontrollers. |
| Sky Computers | | Manufacturer of embedded computer systems for very high performance applications. |
| Solutions Cubed | | Design group specializing in embedded control systems. Provides a range of products for use by electronic enthusiasts and OEMs. |
| Square One Industries, Inc. | | Offers a full line of quality PC/104 modules, single board computers, CPU boards, active and passive backplanes, and embedded control products. |
| STMicroelectronics | | Global semiconductor company whose products include microprocessors and microcontrollers. |
| Strategic Test | | Supplier of intelligent data acquisition boards for real-time control under Windows, and the X-BUS range of miniature embedded PCs and I/O modules. |
| STX | | The STX is the standard for embedded PC computer boards and systems. |
| SX List | | Devoted to Ubicom (Scenix) SX embedded controllers. Large code library, FAQ section, instruction reference and links. |
| Synso Inc. | | Tiny yet powerful ARM-based computer with Linux system installed for embedded applications. |
| Syntilla Systems | | Designers and manufacturers of custom and standard computer interface boards for personal and industrial applications. |
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