Loxi - Easily add an events calendar to any website.
The Stanley Parable - The Stanley Parable is an Action, First-person Perspective, Puzzle-Platform, Exploration and Single-player video game created and published by Galactic Cafe.
Whenever - Casual calendar app for iOS
Portal - Financial Aid Award Letter, - Messages and Calendar, - Grades.
Future - Calendar events around the clock
The Talos Principle - Philosophical first-person puzzle game.