www.overleaf.com is a great platform that allows users to use LaTeX in a web browser, with handy functionality, including compilation, display of the resulting PDF, and collaboration by adding users to the project. The advanced, paid version allows for tracking changes, and other features. The fees, however, aren't trivially low; to use the advanced features, hefty subscription fees are to be paid. The goal therefore is to develop an open source version.

Note that this project has a lot of potential features, and the implementation might be challenging. It is recommended to use existing components where possible. Integration of LLM/Gen-AI technology is certainly possible, for example to improve the writing of the user, or to fix things like references. This should however not be the main focus.