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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.
It is usable for me only with expression search NG (https://github.com/opto/expression-search-NG). TB is my daily driver but with every update I fear that they will destroy sth again: expression search failed to work for over a year due to their breaking changes. Switched to another extension until that one stopped working. Now back on expression search as opto has ported it.
I've only ever worked at places with self hosted Exchange for e-mail and groupware. As a client, I use Outlook Web Access (OWA) most of the time and I think it's fine. It's simple, feels reasonably snappy to me and I like having the same interface on all the different machines I need to login from. Sometimes, I need to reach for the desktop version of Outlook in a Windows VM to access options or features not accessible in OWA (or in the sluggish abomination that is Outlook for Mac). However, in the end I don't care all that much about my e-mail client because I use a simple inbox-zero-ish approach to e-mail and only really need Inbox and Archive folders (as well as a delete function). This works with every client.
To have an offline archive, I also have Apple Mail connected to my Exchange accounts. I never use the app itself but frequently use Spotlight to search for and preview e-mails. However, if I'm already working in OWA, I use the search function in there. In my experience, it works well and doesn't feel significantly slower than searching locally in my offline archive.
[Sidenote: I find it annoying to have to use Spotlight for local e-mail search instead of Alfred.app (which has been my universal search app for many years). Alas, Apple only allows access to the e-mail folder on MacOS for their own apps for some annoying reason these days.]
Outside of work, I have the same setup with Apple Mail and Spotlight for archival and search. As clients, I use K-9 on Android and Apple Mail or runbox7 on the desktop. The latter is the webmail app of Runbox, my e-mail provider of choice (I think the app is pretty good - and open source on https://github.com/runbox/runbox7 ).
FairEmail[0] for Android
My favorite feature is that the app tries to remove tracking pixels. The ability to override the user in the from address is super nice too.
You can download the releases right from GitHub, too.
On top of all of that, the dev (Marcel) goes above and beyond to help solve issues you run into. Even if you haven't bought a license!
[0]: https://email.faircode.eu/