Cooperative Linux!

Cygwin is a Unix-like environment and command-line interface for Microsoft Windows. Cygwin provides native integration of Windows-based applications, data, and other system resources with applications, software tools, and data of the Unix-like environment.

MSYS2 is an independent rewrite of MSYS, based on modern Cygwin (POSIX compatibility layer) and MinGW-w64 with the aim of better interoperability with native Windows software.

Knoppix is an operating system based on Debian designed to be run directly from a CD / DVD (Live CD) or a USB key (Live USB), one of the first of its kind for any operating system. When starting a program, it is loaded from the removable medium and decompressed into a RAM drive. The decompression is transparent and on-the-fly.Although Knoppix is primarily designed to be used as a Live CD, it can also be installed on a hard disk like a typical operating system. Computers that support booting from USB devices can load Knoppix from a live USB flash drive or memory card.There are two main editions of Knoppix: the traditional Compact Disc (700 megabytes) edition and the DVD (4.7 gigabytes) "Maxi" edition. Each of these main editions has two language-specific editions: English and German.Knoppix mostly consists of free and open source software, but also includes proprietary software »

andLinux is a complete Ubuntu Linux system running seamlessly in Windows 2000 based systems (2000, XP, 2003, Vista, 7; 32-bit versions only). AndLinux uses coLinux as its core which is confusing for many people. coLinux is a port of the Linux kernel to Windows. Although this technology is a bit like running Linux in a virtual machine, coLinux differs itself by being more of a merger of Windows and the Linux kernel and not an emulated PC, making it more efficient. Xming is used as X server and PulseAudio as sound server.andLinux is not just for development and runs almost all Linux applications without modification. »

A portable image of Ubuntu that could run in Windows as a native win32 application. Adds capabilities to execute Linux applications and integrate with the Windows desktop.

MobaLiveCD is a freeware that will run your Linux LiveCD on Windows thanks to the excellent emulator called "Qemu".MobaLiveCD allows you to test your LiveCD with a single click : after downloading the ISO image file of your favorite LiveCD, you just have to start it in MobaLiveCD and here you are, without the need to burn a CD-Rom or to reboot your computer.

SpeedLinux is a customized coLinux. coLinux is not a VM but it can be used in the same way. Installation of Speedlinux results in a complete LINUX System with X server running side on side with Windows on a single PC.

Ulteo Open Virtual Desktop is an installable Open Source virtual desktop and application delivery solution for corporations. It allows IT departments to deliver desktops and applications easily and at a lower cost than other solutions. It works in both a Windows and Linux environment.

USBFastBoot is a small utility that helps you to quickly test your bootable USBs or disk images. In fact, currently it works for drives (USB, HDD and CD/DVD), ISO (cd image) and IMG (floppy image). It simply adds a context menu item "Boot on QEMU" that you can click to... boot on QEMU.