LLVM is a collection of libraries and tools that make it easy to build compilers, optimizers, just-in-time code generators, and many other compiler-related programs.

McStas is a tool for carrying out Monte Carlo ray-tracing simulations of neutron scattering instruments with high complexity and precision. The simulations can compute all aspects of the performance of instruments and can thus be used to optimize the use of existing equipment, design new instrumentation, and carry out virtual experiments for e.g. training, experimental planning or data analysis.

A macro processor that is used automatically by the GNU C compiler to transform programs before actual compilation.

A macro processor that is used automatically by the GNU C compiler to transform programs before actual compilation.

A macro processor that is used automatically by the GNU C compiler to transform programs before actual compilation.

Signal is a list of registered asynchronous callbacks.