MPIFX - Modern Fortran Interface for MPI
The open source library MPIFX is an effort to provide modern Fortran (Fortran 2003) wrappers around routines of the MPI library to make their use as simple as possible. The documentation is included inside the repository, but is also available at dftbplus.github.io.
It currently contains only a few routines so far, but if those happen to be the ones you need, feel free to use this project (MPIFX is licensed under the simplified BSD license).
If your desired MPI routine is not yet wrapped up, feel free to contribute to the project to include the target functionality.