  We have introduced self-consistent spin, tidal and dynamical equations of
motion into REBOUNDx, a library of additional effects for the popular N-body
integrator REBOUND. The equations of motion used are derived from the constant
time lag approximation to the equilibrium tide model of tidal friction. These
effects will allow the study of a variety of systems where the full dynamical
picture cannot be encapsulated by point particle dynamics. We provide several
test cases and benchmark the code's performance against analytic predictions.
The open-source code is available in the most recent release of REBOUNDx.
