I use Plain TeX (I have tried to use LaTeX once and I found Plain TeX easier to work with and get right how I intended). I have written macros to do what I want

I use Plain TeX (I have tried to use LaTeX once and I found Plain TeX easier to work with and get right how I intended). I have written macros to do what I wanted, including headings, automatic table of contents, cross-references, and also black bars on the edge of the page to indicate chapters and sections so that they can easily be found by the edge of the book. Since \write in a page is only valid if the page is shipped out, and the references of pages will need to be known before they are printed, so instead I used insertions for this, and the insertion contains altnerating marks and penalties, which are then using \vsplit in the output routine to extract the marks and execute them without shipping out the page during the first pass. Another use of insertions is tables that span multiple pages, that it may automatically add "(continued on next page)" and repeat the table headings on the top of the next page. And, it is also helpful to include mathematical equations in the text; in my opinion that is one of the problems with many other RPG systems that doesn't have enough mathematical equations. It is not yet completed, but it is (and will continue to be) 100% public domain.