jvalleroy.fbx.one is a Fediverse instance that uses the ActivityPub protocol. In other words, users at this host can communicate with people that use software like Mastodon, Pleroma, Friendica, etc. all around the world.
This server runs the snac software and there is no automatic sign-up process.
But my calendar is self-hosted, as an app within Nextcloud (running on my new FreedomBox from Libre Crafts). So I added my Nextcloud account in the Gnome settings, and it shows appointment reminders that are integrated into the desktop (appear under the clock).
LocalSend is an application for cross-platform file-sharing with a user experience similar to Apple's proprietary AirDrop.
https://localsend.org/
It can be more convenient than sharing via #Syncthing or #Nextcloud for large file transfers or one-off transfers between devices, especially across devices running free and proprietary operating systems.
Alternatively, you can transfer files via Bluetooth old-school style, but #LocalSend uses Wi-Fi or ethernet which are much faster.
I got used to having a scratch buffer in Emacs.
I am not using Emacs anymore, but tried to compensate for this by using a ~/scratch.md file. It didn't stick, i.e. wasn't habit-forming.
Trying out a scratch.md in Nextcloud Notes now.
It took me some time to figure out that "Notes is a native app" in Nextcloud means that I just need to create a new text file and start writing. I spent some time searching the menus for an app called "Notes".