| API | Description | Category | Date |
|---|---|---|---|
| 30 Boxes | Calendar service | Calendar | 2006-02-24 |
| Spongecell | Online calendar service | Calendar | 2006-08-25 |
| Google Calendar | Calendar service | Calendar | 2006-04-20 |
| Orange Personal Calendar | Calendar service | Calendar | 2008-03-16 |
| TeliaSonera Calendar | Calendar creation tool | Calendar | 2010-11-30 |
| InfoPark Web Calendar | Event calendar service | Calendar | 2013-01-31 |
| USC Event Calendar | Campus event calendar | Calendar | 2013-05-13 |
| Fuze Box | Internet and mobile communication services | Chat | 2011-03-24 |
| Plings | Places and Activities Database | Entertainment | 2011-09-22 |
| GigMasters | Entertainment booking service | Entertainment | 2012-01-30 |
| Seatwave | Online marketplace for live events | Entertainment | 2012-02-28 |
| Culture24 | Cultural publishing organization | Entertainment | 2012-10-17 |
| Pollstar | Concert industry information | Entertainment | 2012-11-05 |
| Zvents | Local events search and community | Events | 2006-02-14 |
| Eventful | Local events discovery and demand | Events | 2005-10-31 |
| Spraci | Events and clubs database | Events | 2006-02-14 |
| Upcoming.org | Collaborative event calendar | Events | 2005-11-19 |
| Eventfinder | New Zealand events calendar | Events | 2007-04-02 |
| Fizber Events | Local events search services | Events | 2010-10-25 |
| Eventbrite | Event registration, marketing, and promotion services | Events | 2008-08-02 |
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