KDE Itinerary application, associated libraries and KMail plug-in.
Mailing list: https://mail.kde.org/mailman/listinfo/kde-pim
IRC/Matrix: #kontact
Repositories:
https://phabricator.kde.org/source/kpkpass/ (Apple Wallet pass handling)
https://phabricator.kde.org/source/kitinerary/ (Data model/extraction/augmentation)
https://phabricator.kde.org/source/kpublictransport/ (Public transport journey and realtime data query API)
https://invent.kde.org/kde/itinerary (mobile app)
https://phabricator.kde.org/source/kdepim-addons/ (KMail plug-in)
https://phabricator.kde.org/source/kitinerary-workbench/ (Extractor development tool)
Usage and troubleshooting: https://community.kde.org/KDE_PIM/KItinerary
Supported providers: https://community.kde.org/KDE_PIM/KItinerary/Supported_Providers