The growing complexity of modern engineering systems demands robust, scalable, and open computational tools for simulating nonlinear mechanical behavior. OpenRadioss [1], an open-source finite element solver, meets this need by enabling advanced simulations of transient dynamics, impact, failure, and multiphysics phenomena. Originally a commercial code for crash and safety analysis [2], its open-sourcing in 2022 transformed it into a community-driven platform promoting innovation in computational mechanics. This work outlines OpenRadioss’ framework, highlighting its explicit nonlinear solvers, contact algorithms, and material models. Capable of handling large deformations and complex interactions in metals, composites, foams, and biological tissues, OpenRadioss finds applications across automotive, aerospace, civil, and biomechanical domains. Its scalability on modern HPC systems ensures efficiency for large-scale problems. Through benchmarks and examples, we demonstrate how OpenRadioss advances applied sciences by democratizing access to high-fidelity simulations and fostering collaboration, transparency, and reproducibility. Combining mature nonlinear dynamics algorithms with open-source practices, OpenRadioss drives innovation across research and industry alike [3]. Together, the commercial and open-source versions form a complementary ecosystem—balancing industrial reliability with open innovation—to advance both research and real-world engineering applications.