Scheduled for iOS - A reminder for your messenger
Cronofy - Unified Calendar API for developers
Raft Calendar - A fun and beautiful calendar for couples and close friends
Campaign Calendar - Campaign Calendar by Bracket Labs builds a marketing calendar from your Salesforce Campaigns.
Podchaser Pro - Create your most effective marketing campaign on podcasts
ApPHP Calendar - ApPHP Calendar is a PHP calendar script that may be easily integrated and used with various PHP projects, such as schedulers, event, etc.