| ocamlPackages.libc | Raw definitions and bindings to platforms system libraries |
| ocamlPackages.reason-native.fp | Library for creating and operating on file paths consistently on multiple platforms |
| ocamlPackages.reason-native.dir | Library that provides a consistent API for common system, user and application directories consistently on all platforms |
| ocamlPackages.async_js | Small library that provide Async support for JavaScript platforms |
| ocamlPackages.janeStreet.async_js | Small library that provide Async support for JavaScript platforms |