A few days ago, I suggested a common dependence on Frederick Henry Hedge's translation of the Liturgy of St. James for Unitarian, Universalist and Free Christian communion practice. Rashly I said would create a parallel text showing this development if I could find the software to typeset it.
I think I found what I was remembering: the parcolumns LaTeX package, in part because it can handle more than two columns in parallel. Shall test it, sooner or later, but I thought this tool would be helpful for others making liturgical comparisons.
As I proceed, I'll also note which LaTeX graphical user interface (GUI) I've chosen, 'cause there's no way I'm doing this in a plain text editor.