Quild

The QUILD (Quantum-regions Interconnected by Local Description) program has been developed for enabling calculations through multi-level approaches, in which different computational treatments are used for different regions of the system under study, see the separate Quild manual.

Hybrid Engine

The Hybrid engine is meant for mechanical or electrostatic embedding and QM/MM (QM/QM’) calculations that combine multiple engines. Some of the functionality of QUILD can be achieved using the Hybrid engine. See the separate Hybrid Engine manual.