The vienna computing library (viennacl) is a scientific computing library written in c++ and based on opencl. it allows simple, high-level access to the vast computing resources available on parallel architectures such as gpus and is primarily focused on common linear algebra operations (blas levels 1, 2 and 3) and the solution of large systems of equations by means of iterative methods with optional preconditioner.

viennacl is header-only with no binary library and projects using it only need to link against a conforming opencl implementation.