LyX https://www.lyx.org/ https://www.lyx.org/ Have been using this for all my projects private and commercial for the last 5 years. - writes a file so you can

LyX https://www.lyx.org/ https://www.lyx.org/ Have been using this for all my projects private and commercial for the last 5 years. - writes a file so you can store it in Git, use the same workflow with branching etc. as the code the documentation documents - has a GUI so you can just use it like Word etc. - Free (monetarily) so if I'm using outsourced developers they can all afford it - Works on Windows, Mac, Linux, so no matter what my developers are using they can use it. - Can generate PDFs but I don't find that feature (which in a way is its main advertised feature) that useful. Looking at them in LyX on the screen is good enough for me.