Emacs org mode, + orgzly
Many features (agenda, tasks, ref keeping...) come out of the box. Highly DIY for advanced features (like, say, sound integration), but the possibilities are endless. And let's admit it: emacs has a steep learning curve, emacs lisp even more so.
Mainly linux desktop. I use orgzly and syncthing to keep some org files available on my android devices.
Comments: 1
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03 Jan, '21
PWFor reference: the manual ( https://orgmode.org/manual/ ) gives a good overview of what you get out of the box.