The Endless Engine is a data-driven, recursive, randomization engine which supports conditional randomization, linear, normal, and exponential distributions, and more!
When I started working on the project that would eventually become the Endless Engine, I knew I would want the data to be flexible enough that I could adapt it to various RPG systems and settings. Because of this, I thought it should be easy enough for even users with minimal technical skills to swap in their own data sets. Keeping the Endless Engine as vanilla JavaScript and not relying on external dependencies, hosting, or running a local server like Node.js meant that other users could download the sample, swap in their own data, and run it locally. This also means users can create their own randomizers for data from licensed information as long as they don't redistribute it.
To get the Endless Engine running, you need a little knowledge of HTML and JS data structures, but no more. In fact, everything you need to get started is in the sample code. You can try the sample out here, or you can download the sample code from the Endless Engine github.
Using the Endless Engine In Your Own Code: The Randomizer Class
If you want to work the Endless Engine in with your own JavaScript, start here!
Creating Your Own Endless Engine Data
If you just want to start playing with randomizing your data, you can start by replacing the sampleData in the sample code using instructions here!