I want to track how long I use each application. Hopefully it would detect when the mouse is moving or not. I'm trying to calculate the metrics of how much time I spend wasting, vs being productive.

There are lots, actually.
https://www.kde.org/applications/uti.../ktimetracker/

Project Hamster, aka the Gnome Time Tracker:
https://launchpad.net/~dylanmccall/+...cker-git-daily

An online one is called Toggle...don't think it's open source but a friend uses it on Linux.

Also, https://www.teamwork.com/, also not open source but they have a Linux desktop app that records what you are doing. Again, a friend of mine used it before switching to toggle.


Not sure about mouse tracking; not even sure how that would show productivity (for instance, less mouse movement for me means more productive, but for others it might mean more productivity.

I think there are others, but those are the ones that leap to mind.

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(Koff, koff ...) Measure the amount of time that you're looking at a web browser that is dialed-in to LQ?

You want the BSD accounting package? It is usually available as an option.

But it will NOT identify wasting time.