iSpy is written in c#. The project is a Visual Studio 10 solution (you will need Visual Studio 2010 to compile it).

Download the latest version here: http://ispysoftware.svn.sourceforge.net/viewvc/ispysoftware/
(click 'Download GNU tarball')

If you make any improvements or bug fixes to the code, please let us know

iSpy uses adapted open source code from the following projects:

AForge.net
Accord.net
NAudio
FFMPEG
Flowplayer
nVLC

(These projects are not required to build iSpy).