We run Taiga and it seems to work fine.

If you want to link to external sources in a structured way and you don’t mind tweaking the looks, SolidOS (ot another SOLID app) has a task list/tracker.

I keep my personal tasks in org-mode or org-roam.

That would be Emacs.

Emacs is like an operating system bringing various tools into the same editing interface, including email. Emacs is very adaptive, you can get VIm like bindings through evil-mode.