One Thing – Put a Single Task/Goal in the GNOME Panel
Next time you need to remember something important, don’t reach for a sticky note and pen. Instead, reach for the One Thing GNOME extension.
This Linux version of the One Thing app for macOS works in the same way: you enter some text (and yup, emoji is supported too), and whatever you enter appears in the Top Bar (the panel that runs along the top of the screen in a standard GNOME Shell; if you use Dash to Panel, it’ll appear in that).
As concepts go it’s not the most imaginative (so no cries of who copied who), but it doesn’t need to be. Sometimes, all it takes for us to actually get on and do something is to be reminded to do it. This does that, simply.
There are no settings; you can’t customise the font, change text colour, make it blink, flash, or animate in some eye-catching way. You also can’t choose where on the panel the text sits (though this would be handy feature to have). Your “one thing” just stares out at you from the GNOME panel, from beside the Status Menu.