For your information - The article DFTB+, a software package for efficient approximate density functional theory based atomistic simulations, published in J. Chem. Phys. 152, 124101 (2020); https://doi.org/10.1063/1.5143190, has been re-printed in Psi-k Highlights publication, https://psi-k.net/highlights/ DFTB+ is the premier tight-binding package with rich functionality and good computational performance. It is an important part of Materials Studio quantum mechanical offering, especially as it is now connected to FlexTS for studies of reaction chemistry.
.