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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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davx5-ose
DAVx⁵ is an open-source CalDAV/CardDAV suite and sync app for Android. You can also access your online files (WebDAV) with it.
Exchange has an API that could be used for syncronising. I always wanted to build this into vdirsyncer [1] (so that I can use khal with my work Office 365 account) but haven't found the time.
https://github.com/pimutils/vdirsyncer.
This looks very interesting. As the original author of khal (another terminal calendar) [1] I love some more competition in this space.
[1] https://github.com/pimutils/khal
I feel you, but to me it was worth the effort and now I have a setup that works.
I run a calendar server[0] that is my main calendar repository. And I use vdirsyncer[1] to sync to my laptop to use khal[3]. On the Android side I sync with davx5[4].
This allows me to subscribe to webcal calendars, which outlook365 offers, and syncs them to my two main devices.
Not perfect because that means I can't edit my outlook calendar from within this system ( and a reminder why open standards and interoperability are important ), but it means that my private calendars and addressbooks are self hosted.
You are right though, that takes effort. And I want to snark at microsoft for not supporting caldav, but then I am waiting for gnome-calendar to support it as well. It doesn't seme to and that feels a bit strange to me.
[0] https://radicale.org/