CoSchedule - CoSchedule is the #1 marketing calendar that helps you stay organized and get sh*t done. Plan, produce, publish and promote your content.
Frozen Goodies - An advent calendar to get the chance to win daily prizes
ChronoFlo Calendar - ChronoFlo Calendar allows you to make beautiful interactive calendars that you can share on the web.
24 Ways - An advent calendar for web geeks
CalendarX - Get a calendar your audience can follow
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.