Future - Calendar events around the clock
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
Event Calendar App - A simple, easy to manage, way of displaying events
Toby for Teams - Better bookmarks, now with collaboration baked in 🔖
Whenever - Casual calendar app for iOS
Manifold - Manifold GIS is a combination of mapping, CAD, DBMS and image processing.