This is a tool that calculates probabilities with presets related to Hypixel SkyBlock. Most of the modes are based on the Poisson binomial distribution, computed using an implementation based on this Python package, which is an FFT-based approach described in detail here.
The tool is accessible at https://mabi.land/luckalyzer/.