UPC++ is a C++ library that supports Partitioned Global Address Space (PGAS) programming, and is designed to interoperate smoothly and efficiently with MPI, OpenMP, CUDA and AMTs. It leverages GASNet-EX to deliver low-overhead, fine-grained communication, including Remote Memory Access (RMA) and Remote Procedure Call (RPC). This directory contains a mirror of the download archive for the UPC++ implementation (whose installer automatically downloads GASNet-EX) and associated documentation. The source downloads are officially hosted at: https://upcxx.lbl.gov For more information, see the README.md, INSTALL.md files and docs directory embedded in each archive, or contact upcxx@googlegroups.com.