DFTB+ is a fast and efficient versatile quantum mechanical simulation software package. Using DFTB+ you can carry out quantum mechanical simulations similar to density functional theory but in an approximate way, typically gaining around two orders of magnitude in speed. (See About DFTB+ for further details.)

You can use DFTB+ either as a standalone application or embed it into your own academic or commercial simulation package as a library.

DFTB+ is free software licensed under the GNU Lesser General Public License.

DFTB+ 18.2 released 2018-08-19 

The next stable release of DFTB+ (Release 18.2) is available for download now. This release contains mostly bug-fixes, especially for the erroneous calculation of the LJ-type dispersion for periodic systems. Have a look on the Change Log for further details.

DFTB+ 18.1 released 2018-03-02 

After eight months of hard work, we are pleased to announce the next release of DFTB+. Release 18.1 contains several new features and improvements. Most notably the code has been MPI-parallelised, enabling you to now also model large systems efficiently with DFTB+ on massively parallel systems and compute clusters. We hope you will continue to find DFTB+ useful for your scientific research. As always we are looking forward to your feedback, suggestions and contributions.