REBOUNDx allows you to easily incorporate additional physics into your REBOUND simulations. The main code is written in C, and we provide a convenient Python wrapper. For an overview of the technical details and some practical recommendations, see Tamayo, Rein, Shi and Hernandez 2019. The paper publication lines up with REBOUNDx version 3.0.0.

For a list of supported effects, and descriptions of the parameters that need to be set for each effect, see the documentation at http://reboundx.readthedocs.io. You can also find installation instructions and a quickstart guide there.

We have tried to structure the documentation in a way that makes it easy to credit the various people who have contributed to any given effect. Please see the Attribution section at http://reboundx.readthedocs.io for direct links to ADS.

• Added interpolator object for interpolating parameters
• Many improvements to the documentation

• Generalized tides_precession effect to general constant time lag model (Hut 1981)