Simulate radial velocity curves with a wide range of parameters.
One of the most important method for observing exoplanets is the radial velocity method. The University of Nebraska-Lincoln astronomy education group has released a web-application where you can simulate the radial velocity variations that a planet introduces into its star. You can vary stellar mass, planet mass, orbit & observation parameters and can see immediately how this influences the measured radial velocity curve.
Screenshot of the RV simulator by the UNL astronomy education group.
Find the simulator here: https://astro.unl.edu/classaction/animations/extrasolarplanets/radialvelocitysimulator.html