A couple of years ago, I started writing a plugin for X-Plane which would allow me to drop parachutists from my plane. I had to dig up my old high school physics books (which were lost, but there is wikipedia and other websites) but in the end I could realistically simulate objects falling down to earth. One disadvantage was that the plugin was written in Python, and had accumulated a massive amount of crud after all my experiments. Another was that the mass of the objects was not counted towards the planes in X-Plane, you could throw a hundred parachutists from a C172 without problems (the mass was only used in the calculations when falling).

Fast-forward one year. The plugin has been rewritten in c++ (easier to install, faster), and one important improvement is that the mass of the objects is now taken into account. The plugin now also functions as a load manager, and it depends on the plane how many objects you can load and drop or unload again. Another improvement is that different objects can be loaded simulaneously!

The main page has more information, including screenshots: https://itmasala.eu/drop/