Cling is an interactive C++ interpreter, built on the top of LLVM and Clang libraries. Its advantages over the standard interpreters are that it has command line prompt and uses just-in-time (JIT) compiler for compilation.
Ch is a C/C++ interpreter and scripting language environment used by teachers, students, engineers and scientists around the world to learn math, numerical computing, C/C++, and write cross-platform code and embedded scripts quickly and efficiently.
CINT is an interpreter for C and C++ code. It is useful e.g. for situations where rapid development is more important than execution time. Using an interpreter the compile and link cycle is dramatically reduced facilitating rapid development.