SyncMyTracks - Sync your activities of the most popular sports tracking services.
Loxi - Easily add an events calendar to any website.
tapiriik - Automatically synchronize your fitness activities between Garmin Connect, Runkeeper, Strava and more.
Event Calendar App - A simple, easy to manage, way of displaying events
FitnessSyncer - Make Sense of Your Health and Fitness Data
Whenever - Casual calendar app for iOS