SPIM: The OVPsim 500 mips MIPS32 emulator, can be used to develop software using virtual platforms, emulators including MIPS processors running at up to 500 MIPS for MIPS32 processors running many OSes including Linux. OVP is used to build emulators of single MIPS processors or multiple - homogeneous MP or heterogenous MP.
CPU Sim: A Java application that allows the user to design and create a simple architecture and instruction set and then run programs of instructions from the set through simulation
DAPHNE is an arcade emulator application that emulates a variety of laserdisc video games with the intent of preserving these games and making the play experience as faithful to the originals as possible. The developer calls DAPHNE the "First Ever Multiple Arcade Laserdisc Emulator". It derives its name from Princess Daphne, the heroine of Dragon's Lair.
Cygwin: For Microsoft Windows, provides a POSIX environment and system libraries. This does not allow one to run unaltered Linux/Unix binaries. However, it allows use of the gcc compiler collection to compile software written for these operating systems from source code.
WINE: Available for most POSIX compliant operating systems, such as Linux, BSD, and Mac OSX. It provides a Win32 API and clean-room implementation of the associated functionality. In contrast to Cygwin, WINE enables the installation and use of unaltered Windows software. Considerable effort has been put into support for video games, including 3rd party extensions which provide custom Windows configurations known to work with a very large list of videogames. In addition, desktop productivity software, including MS Office, is supported. Because of the lack of dependence on the Windows registry, inclusion of statically linked libraries, and historic development from open source projects, portable applications, such as the PortableApps platform and the 300+ available software applications which can be downloaded with it, work with little or no issues.
Printer emulators
Ghostscript: Emulator for printers without PostScript