  The openQ*D code for the simulation of QCD+QED with C$^\star$ boundary
conditions is presented. This code is based on openQCD-1.6, from which it
inherits the core features that ensure its efficiency: the locally-deflated
SAP-preconditioned GCR solver, the twisted-mass frequency splitting of the
fermion action, the multilevel integrator, the 4th order OMF integrator, the
SSE/AVX intrinsics, etc. The photon field is treated as fully dynamical and
C$^\star$ boundary conditions can be chosen in the spatial directions. We
discuss the main features of openQ*D, and we show basic test results and
performance analysis. An alpha version of this code is publicly available and
can be downloaded from http://rcstar.web.cern.ch/ .
