Stable
CamlIDL
[10-Aug-2001, version
1.04,
Stable]

CamlIDL is a stub code generator and COM binding for Objective Caml.
FFI
[16-Aug-2001, version
1.2.2,
Stable]
A foreign function interface package for Objective CAML. It reads C header files and generates a mix of C code and ocaml external declarations.
Mixing OCaml and C
[30-Apr-2008,
Stable]
This tutorial explains how to mix OCaml and C code (function calls, data types, finalisation, compilation with a C library).
SWIG
[05-Dec-2003, version
1.3.20,
Stable]

SWIG is a software development tool that connects programs written in C and C++ with a variety of high-level programming languages. SWIG is primarily used with common scripting languages such as Perl, Python, Tcl/Tk, and Ruby, however the list of supported languages also includes non-scripting languages such as Java, OCAML and C#.
Beta
Confluence
[25-Mar-2004, version
0.9,
Beta]


A powerful logic design language that combines the dataflow and component-based methodologies of HDL with the expressiveness of modern functional programming.
O'Jacare
[01-Jun-2004,
Beta]

O'Jacare is a code generator to help in interoperability between Java and O'Caml through their object model. O'Jacare defines a simple IDL for Java's classes and interfaces descriptions. For communications from Java to O'Caml it owns a callback mechanism. So, you can easily override in O'Caml a method defined in Java. The implementation is based an each language low-level interfaces with C (JNI for Java and external for O'Caml) and uses an extended version of the camljava library. O'Jacare generates all needed wrapper classes and enables static typechecking in both world.
perl4caml
[01-Apr-2005, version
0.9.3,
Beta]
Interface for calling Perl code from OCaml.
Pycaml
[29-May-2002,
Beta]

A system for binding OCaml code with python.
Alpha
CamlJava
[18-Feb-2002, version
0.2,
Alpha]
This is a very preliminary release of CamlJava, an OCaml/Java interface. Currently, it provides a low-level, weakly-typed OCaml interface very similar to the JNI.
Pycaml (2)
[10-Oct-2011, version
2011-10-05,
Alpha]
OCaml/Python interface.
Saffire
[31-May-2005,
Alpha]

Saffire is a static analysis program that detects bugs in programs that use the OCaml/C foreign function interface. Saffire works by performing type inference across both OCaml and C to make sure that values are used consistently across the language boundary. For instance, if a OCaml passes a record to a C function, that C function should not treat the data as an integer. Saffire also tracks what C variables point into the OCaml heap and ensure they are always registered with CAMLparam/local before any allocation functions are called.
Development code
An example of OCaml/Fortran interface
[10-Aug-2001,
Development code]
Cigen
[10-Aug-2001,
Development code]
Generation of stubs for Caml-to-C interface based on a .h header file (work in progress, not yet complete).
Forklift
[26-Aug-2003, version
pre-alpha,
Development code]
A program for generating language bindings based on C header files.