At its core, NSIMD is a vectorization library that abstracts SIMD programming. It was designed to exploit the maximum power of processors at a low development cost. NSIMD comes with modules. As of now two of them adds support for GPUs to NSIMD. The direction that NSIMD is taking is to provide several programming paradigms to address different problems and to allow a wider support of architectures. With two of its modules NSIMD provides three programming paradigms: - Imperative programming provided by NSIMD core that supports a lots of CPU/SIMD extensions. - Expressions templates provided by the TET1D module that supports all architectures from NSIMD core and adds support for NVIDIA and AMD GPUs. - Single Program Multiple Data provided by the SPMD module that supports all architectures from NSIMD core and adds support for NVIDIA and AMD GPUs. NSIMD provides C89, C++98, C++11, C++14 and C++20 APIs. All APIs allow writing generic code. For the C API this is achieved through a thin layer of macros; for the C++ APIs it is achieved using templates and function overloading. The C++ APIs are split into two. The first part is a C-like API with only function calls and direct type definitions for SIMD types while the second one provides operator overloading, higher level type definitions that allows unrolling. C++11, C++14 APIs add for instance templated type definitions and templated constants while the C++20 API uses concepts for better error reporting. Binary compatibility is guaranteed by the fact that only a C ABI is exposed. The C++ API only wraps the C calls.