25DaysOf - A customizable advent calendar, for everyone
24 Ways - An advent calendar for web geeks
UXmas - An advent calendar for UX folk
25 Days of Vim - A Vim Advent Calendar
Llama Sounds Advent Calendar - Fake llamasounds for each day until Christmas
CSS Christmas Calendar - CSS Christmas Calendar 🎄 is an experiment to demonstrate that almost any design concept is achievable with only HTML + CSS.No Javascript, no SVGs, no bitmap images.All code is linked and available, so you can dig deeper.