Founded by the Numerical Methods Group at the Universität Heidelberg, deal. II is a renowned C++ program library designed for the computational solution of partial differential equations using adaptive finite elements. With its advanced programming techniques, deal.

II provides a modern interface to intricate data structures and algorithms. The library's core mission is to facilitate the rapid development of modern finite element codes, allowing developers to efficiently build programs that utilize adaptive meshes, various tools classes, and other essential aspects of finite element programs. Developed by a globally diverse group of contributors and used in both academic and commercial projects, deal.

II has received numerous accolades, including the prestigious 2007 J. H. Wilkinson Prize for Numerical Software.

Offering support for one to three space dimensions, adaptive grid handling, an extensive range of finite elements, parallelization capabilities, comprehensive documentation, modern software techniques, and a stand-alone linear algebra library, deal. II empowers researchers and practitioners in the field of adaptive finite element methods. Furthermore, with its open-source nature and commitment to ongoing collaboration, deal.

II invites users to contribute to its continued development