Throughout the website, I linked to parts of many different websites. For some of them, I haven’t linked to their home page. Well, here they are. By the way, my editorial position is not necessarily that of the authors of these sites. But all of these sites are helpful for folks with an interest in Church History.
The Christian Classics Ethereal Library from Wheaton. This is where you can find all 38 volumes of the Early Church Fathers, plus tons of other documents from throughout Church History.
www.reformed.org has a great collection of historic church documents, especially during the reformation. I used them extensively.
I used ImageViewer to make the timeline images zoomable/panable.
I used Wikimedia Commons as a source of copyright-free or open images.