Open Source COBOL Software
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COBOL Software
Browse free open source COBOL Software and projects below. Use the toggles on the left to filter open source COBOL Software by OS, license, language, programming language, and project status.
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GnuCOBOL
A free COBOL compiler
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. -
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RecordEditor
Editor for Fixed Width, Csv and Existing Xml files.
The RecordEditor is a Data File editor for Flat Files (delimited and fixed field position). It supports Unix / PC / Legacy (e.g. Mainframe) file formats, both Text and binary files. The Editor uses a Record-Layout description to format the files. This is ideal for Fixed width (Text or Binary) files, Cobol Data Files, Mainframe files and complicated Csv files. Cobol Copybooks can be used to format Cobol Data files. As well as an editor, The following utilities are supplied * Formatted Compare * File Copy and reformat Utility * FileWizard this is use to work out the format of a File. It can generally find both Text and binary / packed deicimal fields in a file For Simple Csv you should look at its sister project reCsvEditor. Note: The core Editor code is also used in the "Protocol buffers editor" and "Avro Editor" -
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Applewood Computers Accounting System
Accounting system for smaller companies written in GnuCobol.
ACAS contains Sales, Purchase and Nominal Ledgers (Accounts Receivable, Payable and General Ledgers) as well as Stock Control (Inventory Control) along with IRS (Incomplete Records System). This system is written in COBOL and uses the free GnuCobol compiler which compiles via C code and is therefore compatible with the following platforms: Linux, Unix, Dos, Mac OSX, Windows providing you have installed the GCC C compiler or an equivalent as well as GnuCobol. at a minimum, v2.0+. Note that all testing is done using v3.2. The current version utilises standard Cobol files, be they sequential or indexed. The beta version, offers additional support for Mysql and Mariadb. This is available as v3.3 and as a nightly build direct from the lead programmer. -
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Accounting Including: Point-of-sale, Invoicing, Job Costing, Production, Orders, Quotations, Inventory (Stock), Accounts Receivable (Debtors), Accounts Payable (Creditors), General Ledger, Management Reports, Reconciliations
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TinyCOBOL
COBOL compiler for the PC x86-32 platform.
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. -
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LegacyInsight
Legacy reverse engineering tool
LegacyInsight is an AI-powered reverse engineering platform that transforms legacy software systems into comprehensible business logic. Using cutting-edge GenAI, it analyzes legacy and extracts core operations, business rules, and data transformations—all translated into natural language. LegacyInsight supports enterprise-grade systems built on Java, COBOL, NET and other legacy stacks, helping organizations reclaim understanding of business-critical code. -
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GnuCOBOL
A collection of GnuCOBOL programs
This is a collection of COBOL programs, in order to contribute, share and disseminate the GnuCOBOL (formerly OpenCOBOL) project: https://sourceforge.net/projects/open-cobol/ All programs are written by Juan Carlos Negrete, from middle 2018 as at date. Some GnuCOBOL programs could also have been created by other collaborators, in which case they are listed in the AUTHORS and THANK YOU files. Copyright 2018-2025 Free Software Foundation, Inc. All these programs are free software; you can redistribute it and/or modify them under the terms of the GNU General Public License as published by the FSF. Downloads: https://sourceforge.net/projects/gnucoboldev/files/ Wiki: https://sourceforge.net/u/alphastation/wiki/Home/ -
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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.
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This project has moved to GitHub ! The version here at SourceForge will remain for historic purpose. Koopa is a parser generator, made for COBOL. It can handle source files in isolation (no preprocessing required) and doesn't mind the presence of CICS/SQL fragments. The grammar is easily extensible in a way which minimizes the impact on the overall code.
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TP-COBOL-DEBUGGER
A COBOL debugger for GnuCOBOL/OpenCOBOL written in GnuCOBOL
A COBOL debugger for GnuCOBOL written in GnuCOBOL. Works with both current GnuCOBOL and old GnuCOBOL/OpenCOBOL 1.1; could be used for other vendors with slightly modifications, too. Take a look at https://gnucobol.altervista.org/tp-cobol-debugger/ -
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Coboldoc is a java web 2.0 style interface for analyzing COBOL. It maintains its own cross reference database for static & dynamic calls to help with impact analysis or for general COBOL surfing. It's also designed to run directly on z/OS
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Cobxref
Cobol Cross reference tool for GnuCobol written in Cobol
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 -
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EDITEL
EDITEL is a screen editor/code generator for GnuCOBOL programmers
One of the hardest things to do when coding with COBOL is translating a screen design into code. The process may take hours, not to say days. In my old BLIS-COBOL, COBOL 74 and COBOL 80 /85 days (and those last 2 had the SCREEN SECTION which helped a lot !), I recall spending a significant amount of time dedicated to that activity. Time that could be used for more productive activities like coding and resolving bugs, for instance. Having said that, I developed a Screen Editor (similar to a Screen Painter, as some tools may call it) which allows the user to create screen layouts (which includes the use of colors) with delimited fields and respective input masks, and finally generate the SCREEN SECTION code that reflects that layout. All of it automatically - no code needed. The idea came from a program I used to use named EDITEL. I have adapted the concept (it was originally built for BLIS COBOL systems) and created a version that does this for GnuCOBOL and Microfocus COBOL. Enjoy ! -
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dbpre
SQL precompiler for COBOL
SQL precompiler developed for Gnu-COBOL and MySql. -
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Eclipse COBOL Plugin
COBOL Plugin for Eclipse
This Eclipse plugin was originally for Fujitsu COBOL for the Eclipse IDE. I am proposing that we use it to work with GnuCOBOL. GnuCOBOL is Free as so with Eclipse. Perfect Match -
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CobolToCsv
Convert Cobol Data Files to/From Csv
This project will convert Cobol Data Files to/From Csv files using a Cobol Copybook. -
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Stingray - Schema-Based File Reader
Simple handling of numerous data file formats, even COBOL EBCDIC.
Stingray contains a number of components for reading spreadsheets and other flat files. It copes with COBOL files (in EBCDIC) and even COBOL Copybook (or DDE) definitions. Simple Python programs can handle a wide variety of files. This is the Python3.3 release. -
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a command line preprocessor to use gtk libraries with opencobol 1.1 with object orientation syntax giving it gui capabilites. Ultimate resource can be uploaded from www.opencobol.altervista.org the site contains a translator to get in your native language all details about guicobol. The incoming version will update within some weeks. it uses the AGAR GUI TOOLKIT. Do not forget to visit github to get latest changes... here will be uploaded less frequent as final version (expected for april)
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IDE with debugger integrated for develop with z390 emulator. English and Spanish Interface is released. * Added an automatic z390 portable mainframe validator to be configuration easily
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Parse, analyze and -- most importantly -- use COBOL data definitions. This gives you access to COBOL data from Python programs. Write data analyzers, one-time data conversion utilities and Python programs that are part of COBOL systems. Really.
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COBOL Utilities Project
All in, COBOL
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 -
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COBOL XML File Parser
COBOL XML file parser
This program is intended to process an XML formatted file of data in one pass rather than record by record. The program does not handle "Attributes". -
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COBUnit is a unit testing tool for COBOL. It provides a way to do Test Driven Development in legacy COBOL.
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The cobcurses project has moved to github.com. Visit https://github.com/ve3wwg/cobcurses for all future project updates and documentation. This project consists of a Cobol interface to curses(3X) using a Screen Designer utility. This project is being developed for use with the Open-Cobol compiler project.
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Cobol Projects
Personal Cobol projects that may be of use or interest to others
This repository is for personal Cobol projects. The projects are stored here in the event someone needs to look at Cobol code for any reason. Most, if not all, of the code was created for personal projects and not professional use. Nevertheless, if the code is useful, feel free to download a copy and use in your own projects.