| [pocl](http://portablecl.org) | PoCL is a portable open source (MIT-licensed) implementation of the OpenCL standard (1.2 with some 2.0 features supported). |
| [poppler](https://poppler.freedesktop.org) | Poppler is a PDF rendering library |
| [PROJ](https://proj.org) | Program proj is a standard Unix filter function which converts geographic longitude and latitude coordinates into cartesian coordinates |
| [PRRTE](https://docs.prrte.org/) | PRRTE is the PMIx Reference RunTime Environment |
| [pybind11](https://pybind11.readthedocs.io) | pybind11 is a lightweight header-only library that exposes C++ types in Python and vice versa, mainly to create Python bindings of existing C++ code. |
| [PyYAML](https://github.com/yaml/pyyaml) | PyYAML is a YAML parser and emitter for the Python programming language. |
| [RapidJSON](https://rapidjson.org) | A fast JSON parser/generator for C++ with both SAX/DOM style API |