deal.II is a free, open-source library to solve partial differential equations using the finite element method.

[3] The founding authors of the project — Wolfgang Bangerth, Ralf Hartmann, and Guido Kanschat — won the 2007 J. H. Wilkinson Prize for Numerical Software for deal.II.

[4] Today, it is a worldwide project managed by around a dozen "Principal Developers"; over the years several hundred people have contributed substantial pieces of code or documentation to the project.

The library features The software started from work at the Numerical Methods Group at Heidelberg University in Germany in 1998.

[9] It is developed as a worldwide community of contributors through GitHub[10] that incorporates several hundred changes by dozens of authors every month.