Windows Embedded CE
Small but powerful, Windows Embedded CE is a real-time operating system and powerful tools for building a broad range of small-footprint embedded solutions. * Supports up to 32,000 simultaneous processes * Plug-in for Visual Studio 2005 * Native Real-time operating system * Over 3.9 million lines of shared source code available * Free Demo!

Embedded OEM Development Platform

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TimeStorm - Eclipse-based, graphical tools
TimeStorm delivers a complete set of Eclipse-based, graphical tools that makes it easy for you to develop, debug, and deploy embedded applications, customize and extend the Linux kernel, and customize the filesystem and applications that you are deploying on your embedded applications. TimeStorm runs on Linux and Windows systems and is seamlessly integrated with your target embedded hardware through simple, graphical configuration commands.
preview: http://www.timesys.com  

Microsoft Windows Embedded - Try it free!

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VLX Embedded
VirtualLogix™ VLX Embedded is a customizable real-time virtualization solution for performance-critical products within the embedded space where cost is crucial. VLX Embedded allows developers to consolidate designs comprised of multiple compute platforms, onto a single platform - all while maintaining performance for time-critical tasks. VLX Embedded can significantly lower your bill of materials and operating costs.
preview: http://www.virtuallogix.com  

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VLX for NI Supporting Intel® Core Microarchitecture™
VirtualLogix™ VLX for Network Infrastructure supporting Intel Core Microarchitecture provides a virtualization solution for telecommunications and network equipment vendors who wish to consolidate several services or applications based on Linux and/or Real Time Operating Systems onto a multi-core Intel platform with minimum effort and maximum performance. VLX enables vendors to develop new network elements at a reduced cost.
preview: http://www.virtuallogix.com  

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BusyBox: The Swiss Army Knife of Embedded Linux
BusyBox combines tiny versions of many common UNIX utilities into a single small executable. It provides replacements for most of the utilities you usually find in GNU fileutils, shellutils, etc. The utilities in BusyBox generally have fewer options than their full-featured GNU cousins; however, the options that are included provide the expected functionality and behave very much like their GNU counterparts. BusyBox provides a fairly...
preview: http://www.busybox.net