Continuous Glucose Monitoring

If you use Android, you absolutely should try Juggluco (https://www.juggluco.nl/Juggluco/index.html)

It's open source and supports all CGM sensors that I know of.

It has the ability to "broadcast" your data to various destinations and has a built-in https server to export a quick summary view to share with your doctor. It also supports exporting to Abbot LibreView so your significant others can use the LibreView app to view your data.

Don't be intimidated by the UI: it's weird and seemingly outdated, but EVERY part of the UI has a dedicated "help" button that you can click and read for details.

Couldn't be happier since I ditched the Freestyle Libre app (it failed to open after an Android update).

There is also an open-source project Nightscout (CGM in the Cloud) which supports Android and iOS: https://github.com/nightscout

That's interesting, it's almost identical to the xDrip+ android app that has been doing all those things for ~10 years. I wonder why they started from scratch instead of just forking the more popular open source app. Maybe it is a fork, it's not totally clear from that page.