http://www.chip.de/s_specials/Download-Adventskalender_74217484.html https://www.computerbild.de/adventskalender/ https://www.pcwelt.de/specials/xmas/xmas-vollversions-kalender https://sandberg.it/en-gb/calendar/Advent_2018
There's also: https://www.heise.de/download/blog/Der-heise-Adventskalender-3885333 https://www.techradar.com/uk/news Most of them seem to be hardware competitions this year. Others like Techradar think it's a good idea to give away freeware. The downward spiral of advent calendars continues, which is quite a feat considering how bad they have been in recent years...