Gpsim

gpsim is a full system simulator for Microchip PIC microcontrollers.It is distributed under the GNU General Public License.

From their website:

gpsim is a full-featured software simulator for Microchip PIC microcontrollers distributed under the GNU General Public License. gpsim has been designed to be as accurate as possible. Accuracy includes the entire PIC - from the core to the I/O pins and including ALL of the internal peripherals. Thus it's possible to create stimuli and tie them to the I/O pins and test the PIC the same PIC the same way you would in the real world.

External links

* [http://gpsim.sourceforge.net/gpsim.html gpsim official website]
* [http://gpsim.sourceforge.net/gpsimWin32/gpsimWin32.html gpsim on Windows]