+ \item \textbf{wxWindows}\\
+ Used for platform-independent graphical interface. The graphical version
+ of \ctsim\ requires this library.\\
+ \urlref{Web site}{http://www.wxwindows.org}
+
+ \item \textbf{FFTW}\\
+ Used for fast frequency-based filtering and fourier transformations of images.
+ Without this library \ctsim\ will use slower, traditional Fourier transformations.\\
+ \urlref{Web site}{http://www.fftw.org}