Open Source COBOL Compilers

GnuCOBOL (formerly OpenCOBOL) is a free, modern COBOL compiler. GnuCOBOL implements a substantial part of the COBOL 85, X/Open COBOL and newer ISO COBOL standards (2002, 2014, 2023), as well as many extensions included in other COBOL compilers (IBM COBOL, MicroFocus COBOL, ACUCOBOL-GT and others). GnuCOBOL translates COBOL into C and internally compiles the translated code using a native C compiler. Build COBOL programs on various platforms, including GNU/Linux, Unix, Mac OS X, and Microsoft Windows. GnuCOBOL has also been built on HP/UX, z/OS, SPARC, RS6000, AS/400, along with other combinations of machines and operating systems. Copyright 2001-2024 Free Software Foundation, Inc. The cobc compiler is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the FSF; either version 3, or (at your option) any later version. The libcob run time support source tree is licensed under the GNU LGPL.

An open source COBOL compiler for the PC x86-32 platform. Generates GNU assembler and requires GCC to produce a binary. Supports Linux, BSD and MinGW 32 bit platforms.

SQL precompiler developed for Gnu-COBOL and MySql.

COBOL Utilities Project collects free and open-source COBOL utilities, libraries, and test suites, which are independent of any specific COBOL compiler. COBOL-UP supports free and open development. A teamwork discussion group has been established. Threads will be focused, the forum open to any and all COBOL. Developers are encouraged to signal interest in write permissions, as this will be an open to all, COBOL utility project. Mainframe, mid-range, Mac, PC, Hercules, Raspberry. Signal interest, we'll set you up with some (vetted) file, distribution and communication space. Wildcat, GnuCOBOL, Micro Focus, Elastic, RainCode, IBM, Tiny COBOL, all the others, all in. COBOL-UP

RES is a pure Java based Open Source Cobol to Java translator. It creates maintainable Java code for a subset of VS Cobol syntax. It has been developed with JDK, JTB and Javacc.

CobXRef is a Cobol cross reference tool that reads a Cobol source program and produces a file suitable for printing 'as is' that contains all variables, procedure paragraphs and section names referenced where they are defined as well as where they are used throughout the program or module as well as lists of unreferenced data names and paragraph & section names. it is used as a stand alone program. This version includes the code from printcbl which takes in the copy books when used by any COPY verbs in the source. See the readme file for more info. This program is also in the GNUCobol SF area under contributions/tools

A compiler and cross-compiler for (Currently) Cobol (with Fortran being added later). It is intended to be the first self-hosted open-source Cobol Compiler, e.g. the compiler itself will be written using Cobol.

MEDDAC is the seeding point for designing a new approach to Operating System design itself. It is an Open Source project with roots in mainframe design and development the author began in 1979. Monitor Editor Disassembler Decompiler Assembler Compiler

The aim of this project is to create a fully functional COBOL compiler that translate into Java or directly into bytecode.

The Universal COBOL Compiler (UCC) is a Java-based COBOL to Java bytecode cross-compiler. It's made up of a COBOL compiler, a Java-based COBOL runtime, and a package for manipulating Java class files.

The COBOL-IT Compiler

The zCOBOL portable mainframe COBOL compiler with support for compiling multiple dialects of COBOL into any one of several target language executable programs including HLASM compatible mainframe assembler, Java, C++, or Intel assembler. All downloads and other information are kept at the z390 project site; see the home page link for more information.