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Favourite, not sure. Maybe my "favourite" would be the one which would be the hardest to replace with something I like.
There wouldn't be something i can think off that could be irreplaceable. However the hardest thing I like may be FanControl.
For the browser, Firefox is very nice, but it's "just" a browser if you think about it. There is brave, and other open source chromium alternatives if it disappears.
For mail clients, I also like the Mailspring design, however Thunderbird just got a new skin and damn it looks good too.
And for the rest, I don't really know. Either I don't remember right now, or no special "like" for the software. Or I like the closed source software convenience more (I may also have no idea of an open source alternative, or an equivalent in features open source).
It depends on the usage really.
Unfortunately, FanControl is not open source. It uses librehardwaremonitor which is, but the FanControl project does not have source code posted and is not under a FOSS license.
Openhardwaremonitor is the best and most direct competitor to cpuid hwmonitor