https://defordmusic.com/songs-by-category-and-by-voicing/
https://gmajormusictheory.org/Fre.../Holidays/Christmas.html
https://thechurchpianist.com/.../free-christmas-piano.../
https://pianosongdownload.com/christmasfree.html
https://www.mfiles.co.uk/christmas-music-and-carols.htm
https://makingmusicfun.net/htm/christmas_piano_index
https://michaelkravchuk.com/.../arrangem.../christmas-songs/
https://www.music-for-music-teachers.com/christmas-sheet...
https://freesheetpianomusic.com/ (various Christmas titles in the big list)