libCL is an open-source parallel algorithm library written in C++ and OpenCL, released under the Apache 2.0 license. Based on a thin layer of wrapper classes for OpenCL and OpenGL are implementations of parallel algorithms ranging from simple primitives such as sorting, searching and algebra to complex systems of algorithms for computational research and visualization. libCL emerged out of OpenCL Studio, and as such integrates well with the development environment and its rich prototyping and visualization capabilities.