- Notepad++ (as a general text editor/manipulator, I have a separate IDE).

- Google Maps (don't know if that really qualifies as a "tool", but it's one of the highest-utility things I know, either way).

- Discord (have never used the public side of it, but for private comms for a small group of friends keeping in touch and gaming, it's proven an incredibly effective solution).

- Paint.NET (I don't stretch it, but as a "better Paint" for very basic image manipulation, it just works).

Those are the ones I'm particularly fond of. I do use other tools heavily that I like but don't evoke as much appreciation - Visual Studio, VS Code, Chrome, Excel, Google Docs, Outlook, Teams - I'm not sure if those are good-but-not-great or I just take them for granted too much.