  This paper presents a publicly available catalog of 174 numerical binary
black-hole simulations following up to 35 orbits. The catalog includes 91
precessing binaries, mass ratios up to 8:1, orbital eccentricities from a few
percent to $10^{-5}$, black-hole spins up to 98% of the theoretical maximum,
and radiated energies up to 11.1% of the initial mass. We establish remarkably
good agreement with post-Newtonian precession of orbital and spin directions
for two new precessing simulations, and we discuss other applications of this
catalog. Formidable challenges remain: e.g., precession complicates the
connection of numerical and approximate analytical waveforms, and vast regions
of the parameter space remain unexplored.
