There are several creators. If you take a look at the fc-pregmod project on GitGud (direct links are not allowed here on F95), you can click on "Repository->Commits" to see the latest changes to the code. Not counting the merge messages, I see 19 changes in the last week from 5 different authors, modifying more than 50 files. You can also click on "Repository->Contributor statistics" to see who has been active recently.
If you select "Deployments -> Releases", you will see that there is a new release every second month, more or less. The latest one is 4.0.0-alpha27 released two months ago, but personally I prefer to get the latest version directly from git and build it on my computer. If you cannot wait two months between releases, then you can also play with the bleeding edge and build the latest version yourself.
But if you are interested in new content in general, then do not forget that you can also contribute. If you have some coding skills (especially in Javascript and/or Twine+SugarCube), then the file CONTRIBUTING.md in the top-level directory explains the project structure and how you can modify the code. For exemple, you could contribute some new random events and extend the code found in src/events/*. If you are not interested in coding, then you could also write some text describing your new events, open a new issue about that on GitGud, then wait until some benevolent coder turns your text into code. If you are more of an artist, then some image packs are in dire need of a new maintainer. There are many ways to contribute to this project.