Emulator
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Cygwin
Cygwin - Open Source Emulator
Cygwin is a collection of tools which provide a Linux look and feel environment for Windows.
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Qemu
Qemu - Open Source Emulator
QEMU (short for "Quick Emulator") is a free and open-source software product that performs hardware virtualization. QEMU is a hosted virtual machine monitor: It emulates central processing units through dynamic binary translation and provides a set of device models, enabling it to run a variety of unmodified guest operating systems. It also provides an accelerated mode for supporting a mixture of binary translation (for kernel code) and native execution (for user code), in the same fashion VMware Workstation and VirtualBox do. QEMU can also be used purely for CPU emulation for user-level processes, allowing applications compiled for one architecture to be run on another.
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Wine
Wine - Open Source Emulator
Wine is an Open Source implementation of the Windows API on top of X and Unix. Wine provides both a development toolkit for porting Windows sources to Unix and a program loader, allowing many unmodified Windows binaries to run on x86-based Unixes.
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