Which custom CalDAV servers are currently supported by 2Do?

2Do for iOS v3.2 and v2.0 on Mac onwards support most 3rd party CalDAV servers out there, including iCal Server, ownCloud, Fruux, Oracle, Kerio, SabreDAV and so on. 
2Do for Android has similar support starting v2.10 (when CalDAV sync got introduced).
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