Ch is an embeddable C/C++ interpreter for cross-platform scripting, 2D/3D plotting, numerical computing, shell programming and embedded scripting. Cross-platform C/C++ interpreter Ch supports 1999 ISO C Standard (C99) and C++ classes. Ch also supports many industry standards including POSIX, socket/Winsock, X11/Motif, OpenGL, ODBC, C LAPACK, GTK+, Win32, and CGI. With Ch SDK, functions in static or dynamic binary C/C++ libraries can be executed in Ch shell or script file. User-friendly integrated development environment (IDE) ChIDE is efficient and lightweight. No need to create project or workspace to run your program. ChIDE is also the most effective IDE for instructors to make interactive classroom presentations. Shell programming and cross-platform scripting Ch bridges the gap between the C language and shell languages. It is a genuine C shell -- C compatible shell. Ch is an interpretive implementation of C, similar to Unix/MS-DOS shells. With its built-in string type and many enhanced scripting features, Ch is an alternative to other scripting languages for automating repetitive tasks, regression test, and hardware testing. 2D/3D plotting Ch supports high-level C++ 2D/3D graphical plotting. Two and three dimensional graphical plots can be very easily accomplished. With SoftIntegration graphical library (SIGL), the same program using 2D/3D plotting features can be executed in Ch or compiled using C++ compilers. Numerical computing Ch numerical extensions are the best choice for numerical computing in the C/C++ domain. Ch has built-in type-generic mathematical functions and computational arrays for linear algebra and matrix computations. It contains advanced high-level numerical functions for linear systems, differential equation solving, integration, non-linear equations, Fourier analysis, curve fitting, etc. Ch supports C LAPACK, GNU Multiple Precision Arithmetic Library, and GNU Scientific Library.