Joplin is a free open source note taking and to-do app which you can sync online. You can follow at:
It's available for Android, iOS, Linux, Mac and Windows from https://joplinapp.org
Joplin is compatible with a number of syncing services including @nextcloud
This is a brand new server run by the main developers of the project as a spin-off of mastodon.social It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!