Version 2.0 of CTSim is near completion! New Features of CTSim version 2.0: - Entire code-base, except for SGP & EZPlot, cleaned up and re-written. All code converted to C++. - Integrated G2 library for graphical display from command line tools - Graphic front-end (ctsim) initial implemention. Can display projection and image files. - Added frequency-based filtering. Can provide significant speed-up in reconstructions compared to convolution-based filtering. - Added highly-optimized backprojection method (idiff3) - New command-line tools added for image statistics and comparisons with both text and graphical outputs.