I'll have to look into that. Thanks for the info!
I did some more digging and digikam is supposed to be capable of focus stacking but it may require some kind of plugin which I can't find any information on. Might be bundled by default.
Also, you may be interested in a program called entangle for tethered shooting.
Disclaimer: I don't use digikam and only heard of entangle 15 minutes ago so your on your own.
For myself I prefer to keep photography as a casual hobby that I enjoy and a lot of this sounds like too much work for me. Will keep you in mind if I see something else.