The best I know of is https://www.wickeditor.com/ https://www.wickeditor.com/ It is free, open source and surprisingly good(for simple things), but developeme

The best I know of is https://www.wickeditor.com/ https://www.wickeditor.com/ It is free, open source and surprisingly good(for simple things), but developement is on hold or abandoned. (I looked at the source and it is not great, but not horrible either, but with the original creators not around anymore and lack of documentation, would be a pain to overtake)