Yambo is an open source project aimed at studying excited state properties of condensed matter systems from first principles using many-body methods.
As input, yambo requires ground state electronic structure data as computed by density functional theory codes such as Quantum-Espresso and Abinit.Yambo’s capabilities include the calculation of linear response quantities (both independent-particle and including electron-hole interactions), quasi-particle corrections based on the GW formalism, optical absorption, and other spectroscopic quantities.

If want to know more about the Yambo code have a look to the new paper:

https://arxiv.org/abs/1902.03837