| API | Description | Category | Date |
|---|---|---|---|
| 30 Boxes | Calendar service | Calendar | 2006-02-24 |
| Anniversarator | Annual event calendar service | Calendar | 2013-01-15 |
| AOL Calendar | Online calendar service | Calendar | 2010-12-14 |
| Appointment-Plus | Online reservation software | Calendar | 2012-05-04 |
| Arts Holland | Dutch cultural event data provider | Travel | 2012-08-30 |
| Astrid | Task tracking system | Calendar | 2012-10-25 |
| AtMail | Webmail Service | 2012-10-29 | |
| BankHolidays | Swedish banking holiday lookup service | Reference | 2011-02-15 |
| Calgoo | Online calendaring service | Calendar | 2009-03-14 |
| Cheddar | text-based task management platform | PIM | 2012-07-31 |
| ClickBook | Online appointment management service | Calendar | 2012-04-10 |
| ClicRDV | Calendar and Appointment Scheduling Software | Calendar | 2011-04-14 |
| Daum Calendar | Calendar services | Calendar | 2011-07-12 |
| DayDetails | On-this-date lookup service | Entertainment | 2012-10-03 |
| Discordian | Date converter from Gregorian to POEE calendar | Calendar | 2012-03-14 |
| Docket Alarm | Litigation Tracking Service | Tools | 2013-01-08 |
| DoStuffMedia | Music festival data lookup service | Events | 2011-05-13 |
| Eventful | Local events discovery and demand | Events | 2005-10-31 |
| Futuremail | Email Scheduling and Queuing Service | 2011-04-01 | |
| Fuze Box | Internet and mobile communication services | Chat | 2011-03-24 |
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