I think you will find the best resources here. International Consortium of Investigative Journalists https://www.icij.org/ https://www.icij.org/ Many journal

I think you will find the best resources here. International Consortium of Investigative Journalists https://www.icij.org/ https://www.icij.org/ Many journalists in this category also use Ghost for their website which is open-source but I am not sure about other security features https://ghost.org/ https://ghost.org/