A project of the Rocky Enterprise Software Foundation
The community continuation of OpenRadioss
OpenCourant is an open-source finite element solver for crash, impact, and highly nonlinear dynamic simulation — carrying forward the OpenRadioss code base under the GNU AGPL, in the open, where it belongs.
What happened to OpenRadioss?
On October 1, 2026, Siemens discontinued the OpenRadioss project. The website was retired and the GitHub repository — home to four years of community-driven development on the open-source version of the Radioss finite element solver, originally published by Altair in 2022 — was removed without an archive.
The code, however, was released under the GNU AGPL v3, and free software doesn’t disappear just because a repository does. OpenCourant continues from the last available open-source code base, hosted and stewarded by the Rocky Enterprise Software Foundation — so that this work remains open, permanently, for everyone.
Why “Courant”?
The name honors Richard Courant and the Courant–Friedrichs–Lewy (CFL) condition — the stability criterion at the heart of every explicit time-integration solver, including this one. It’s a nod to the numerical foundations this community builds on.
We’re looking for the OpenRadioss community
This fork is only hours old. Right now, the single most important thing is finding each other again. If you were a user, contributor, researcher, or maintainer of OpenRadioss — or you’re simply interested in open-source crash and impact simulation — we want to hear from you.
- Code The solver lives at github.com/OpenCourant/OpenCourant. Issues and pull requests are open.
- Chat Join the #opencourant channel on the Rocky Linux Mattermost.
- Email Reach the RESF directly at hello@resf.org.
Former OpenRadioss maintainers and community leaders: please get in touch. We want governance and direction for this project to be set by the people who built it.
About the RESF
The Rocky Enterprise Software Foundation is the nonprofit home of Rocky Linux, created to ensure that critical open-source software remains freely available and community-controlled. OpenCourant follows the same principle: no single vendor should be able to take this code away again.
News
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Announcing OpenCourant, the community continuation of OpenRadioss
OpenRadioss has been discontinued and its repository deleted. The code lives on: the RESF is launching OpenCourant, and we’re calling on the OpenRadioss community to regroup.