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


Hybrid Engine (QM/MM, QM/QM')
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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.
