Simics is a full-system simulator used to run unchanged production binaries of the target hardware at high-performance speeds. Simics was originally developed by the Swedish Institute of Computer Science (SICS), and then spun off to Virtutech for commercial development in 1998. Virtutech was acquired by Intel in 2010 and Simics is now marketed through Intel’s subsidiary Wind River Systems.

Simics can simulate systems such as Alpha, x86-64, IA-64, ARM, MIPS (32- and 64-bit), MSP430, PowerPC (32- and 64-bit), POWER, SPARC-V8 and V9, and x86 CPUs. Many operating systems have been run on various varieties of the simulated hardware, including MS-DOS, Windows, VxWorks, OSE, Solaris, FreeBSD, Linux, QNX, and RTEMS. The NetBSD AMD64 port was initially developed using Simics before the public release of the chip. The purpose of simulation in Simics is often to develop software for a particular type of embedded hardware, using Simics as a virtual platform.

The current version of Simics is 4.6 and it is available for Microsoft Windows and Linux platforms.

Simics has the ability to execute a program in forward and reverse direction. Reverse execution can illuminate how an exceptional condition or bug occurred. When executing an OS such a Linux in reverse using Simics, previously deleted files reappear when the deletion point is passed in reverse and scrolling and other graphical display and console updates occur backwards also.