The Dalton2015 suite consists of two separate executables, Dalton and LSDalton. The Dalton code is a powerful tool for a wide range of molecular properties at different levels of theory, whereas LSDalton is a linear-scaling HF and DFT code suitable for large molecular systems, now also with some CCSD capabilities.

Together, the two programs provide an extensive functionality for the calculations of molecular properties at the HF, DFT, MCSCF, and CC levels of theory. Many of these properties are only available in the Dalton2015 suite.

Dalton can be run on a variety of systems running the UNIX operating system. The current release of the program supports Linux, Cray, SGI, and MacOS using GNU or Intel compilers (we plan to publish patches for PGI and XL compilers).. The program is written in FORTRAN 77, FORTRAN 90 and C, with machine dependencies isolated using C preprocessor directives. All floating-point computations are performed in 64-bit precision, but if 32-bit integers are available the code will take advantage of this to reduce storage requirements in some sections.