Open Fabric Interfaces
Official MPICH Repository
OpenHPC Integration, Packaging, and Test Repo
Sandia SHMEM is an implementation of the OpenSHMEM Standard over multiple Networking APIs, including Portals4. Sandia SHMEM is designed to be a low-overhead implementation of the SHMEM standard which takes advantage of the many features of the advanced networking APIs, including the Portals 4 specification.