| API | Description | Category | Date |
|---|---|---|---|
| 30 Boxes | Calendar service | Calendar | 2006-02-24 |
| Google Calendar | Calendar service | Calendar | 2006-04-20 |
| Orange Personal Calendar | Calendar service | Calendar | 2008-03-16 |
| Calgoo | Online calendaring service | Calendar | 2009-03-14 |
| TeliaSonera Calendar | Calendar creation tool | Calendar | 2010-11-30 |
| Lifepod Open | Online calendar service | Calendar | 2010-10-28 |
| Setster | Appointment scheduling widget | Calendar | 2010-02-18 |
| AOL Calendar | Online calendar service | Calendar | 2010-12-14 |
| Vodafone Address Book | Access contacts and calendar items on mobile device | Calendar | 2011-02-10 |
| ClicRDV | Calendar and Appointment Scheduling Software | Calendar | 2011-04-14 |
| MINDBODY | Universal Business Management Solutions | Calendar | 2011-04-26 |
| Daum Calendar | Calendar services | Calendar | 2011-07-12 |
| Recollect | Garbage and recycling collection reminder service | Calendar | 2011-08-01 |
| ClickBook | Online appointment management service | Calendar | 2012-04-10 |
| MakePlans | Online scheduling service | Calendar | 2011-11-29 |
| My School Holidays | School holiday search service | Calendar | 2012-02-10 |
| Discordian | Date converter from Gregorian to POEE calendar | Calendar | 2012-03-14 |
| SnapAppointments | Appointment schedule management | Calendar | 2012-05-04 |
| Appointment-Plus | Online reservation software | Calendar | 2012-05-04 |
| Sapo Holiday | Portuguese holiday reference service | Calendar | 2012-05-04 |
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