John Salza and Robert Siscoe, on their Website for their book True or False Pope? Refuting Sedevacantism and Other Modern Errors, has a good overview of Sedevacantist/Conclavist Popes (or "Anti-Popes" from their [SSPX] perspective that accepts Francis as a true pope [albeit, while resisting much of his and other teachings from Vatican II onwards]):
Meet the Sedevacantist Anti-Popes
Be sure to reference this page whenever a Roman Catholic says, with a straight face, that embracing Rome will never result in any confusion.
Meet the Sedevacantist Anti-Popes
Be sure to reference this page whenever a Roman Catholic says, with a straight face, that embracing Rome will never result in any confusion.