GnuCOBOL: the only truly free COBOL compiler
We are the leading French contributor to GnuCOBOL, a GNU project active since 2002. Drop your IBM and MicroFocus licenses. Deploy on Linux, cloud or your own servers, with no rewrite of existing code.
The leading French contributor to GnuCOBOL
GnuCOBOL supports 20+ dialects (IBM, MicroFocus, Bull GCOS and more). We extended it for DGFiP, adapted it to their specific needs, and continue to evolve the compiler. Partners: Clever Cloud, OSE, Linagora, BPI France, NLNet.
Our GnuCOBOL capabilities
Compiler contributions
We extend GnuCOBOL to support proprietary dialects (Bull GCOS, IBM, MicroFocus) and adapt it to your production environments.
Mainframe-to-Linux migration
With full behavior preservation and regression testing.
SuperBOL Studio (VSCode)
LSP, code navigation, autocompletion, error diagnostics, coverage visualization. Available on the Microsoft Marketplace.
COBOL dialect analysis
And compatibility assessment for migration planning.
Large-scale testing frameworks
Validating migrated programs against mainframe output for systems serving millions of users.
Challenges we solve with GnuCOBOL
Mainframe to Linux migration
Leaving the proprietary mainframe with no rewrite cost: GnuCOBOL runs on Linux, cloud and your own servers. Zero IBM or MicroFocus licenses.
GnuCOBOL compiler development
Contributing to and extending the GnuCOBOL compiler to support dialect-specific features, ensuring compatibility with legacy codebases during migration.
Testing & validation at scale
Building comprehensive testing frameworks that validate migrated COBOL programs against original mainframe behavior, ensuring zero regression for systems serving millions.
Legacy system modernization
Two approaches: keep COBOL (modernize what you have with DevOps, CI/CD, microservices) or exit COBOL (a progressive transition to other languages with no service interruption).
