| LDouble | |
| ComplexL | |
| Ctypes | The core ctypes module. |
| PosixTypes | |
| Ctypes_types | |
| Ctypes_printers | |
| Dl | Bindings to the dlopen / dlsym interface. |
| Libffi_abi | Support for various ABIs. |
| Foreign | High-level bindings for C functions and values |
| Cstubs_structs | |
| Cstubs | Operations for generating C bindings stubs. |
| Cstubs_inverted | Operations for exposing OCaml code as C libraries. |