I posted about Inklewriter way back in 2016. It is a tool much like Twine for creating interactive stories. Inklewriter is now back, and free to use on the web. There are several new features, but the biggest is that Iinklewriter is now open source. That means your tech department can install a local version.
The public version allows you to write stories without an account, but you can also create an account, with or without an email address.