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need your mainframe to be


Cobos is the most advanced open source COBOL IDE dedicated
to Mainframe application development.

Based on Eclipse, it combines the best of both worlds
 by capitalizing on the open source community innovation
 and on the Mainframe best practices.

Discover Cobos features

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Invoke a Web service from the mainframe!


The “Mainframe Integrator SCORT Callout Designer” is available!

Import a WSDL (Web Service Descriptor).
Generate COBOL Copybooks used to request and receive information from the Web Service.
Generate Java classes for deployment in a runtime environment.
Deploy artifacts to the mainframe and the web server.
Test the generated code on the Test tab in the SCORT Eclipse Callout Plugin.

Discover Cobos release notes

Cobos  is the disruptive IDE for mainframe developers.

Modern Editors

Mainframe Ready


Eclipse-based COBOL IDE

The COBOL file editor of Cobos brings the best of Eclipse to COBOL programers: a quick and simple browsing into files with the Outline, Syntax coloring, Autocompletion, Open declaration, Compilation error notifications, Code templates, Changes tracking, Versioning... . All these features have been tailor-made for the COBOL development. Cobos adds to these very convenient features some outstanding features such as a "Word like" revision mode, unfolding COBOL sources with COPY REPLACING expansion, customizable tabulations, mainframe-like CAPS ON.

Ready for the Mainframe

Cobos comes with features & components enabling a deep and powerful integration with your mainframe environments, such as z/Navigator, je3270 (terminal emulator, a remote FTP access, extended CVS support...).

Fit with all environments

Big Blue is not your compilation target? Cobos is also packaged for Windows and UNIX operating systems, with additional features such as remote compilation and local program build capabilities, FTP access to UNIX resources...

And many other features...

Cobos provides mainframe developers with many cool features, in order to make mainframe application development more agile and to fit with specific environements: various SCM tool support, FTP remote access, local program build, 3270/5250 terminal emulator, COBOL,JCL,REXX,PL1,RPG editors, etc...
Keep Cool, use Cobos
Cobos 4.1 is now available !
Cobos 4.1 - the professional mainframe IDE for eclipse has been released. Thanks to Cobos, work locally (edit, compile, etc.) on your workstation (Windows and Linux) or connected to your remote environments Mainframe IBM i, z/OS.

On the blog

Cobos 4.1.0 Release Notes

Release 4.1.0 [2019-01-31] Cobos provides an smart environment dedicated to the IBM i System! A Cobos4i feature has been developed for this purpose. In this very first version, Cobos brings a [...]

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