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@@ -10,4 +10,5 @@ FairSync API - Point Of Interests (POI) describes how POIs can be exchanged betw
 # Existing Mapping Plattforms / API Projects
 * [Karte von Morgen](Karte-von-Morgen---API)    
 * [Direkt Regional Einkaufsführer](https://direkt-regional.com/) derzeit Fokus Vorarlberg, Web-App & Apps, gebaut mit ionic                
-* [IN_COMMON](IN_COMMON)
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+* [IN_COMMON](IN_COMMON)
+* [CardDAV](https://tools.ietf.org/html/rfc6352)
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