ESI Group SA is a France-based company engaged in the development and distribution of software packages designed for performing virtual testing. It develops digital simulation software for the numerical simulation of prototypes and manufacturing process engineering in applied mechanics. It provides virtual test applications and solutions for casting, composites and plastics, vibro-acoustics, electromagnetism, biomechanics, fluid dynamics sectors, to realistically simulate a product's behavior during testing to fine-tune the manufacturing processes in accordance with desired product performance and to evaluate the environment's impact on the product performance. It provides its products to various industries, including aeronautics, civil engineering, energy and power, government and defense and education, among others. Its subsidiaries include: Civitec SARL, a manufacturer of electronic resistors; Calcom ESI SA, and Efield AB, among others. Its main shareholder is Crown Energy AB.