@CanadaPlus@SpectralPineapple Ive been using Plenary on Android which does a pretty good job of pulling full articles when available. Don't think its FOSS but its seems to be focused on privacy to a certain extent. I love that it can create a custom widget that can replace the google surveillance oriented click bait feed.
I've been experimenting with a few different options on desktop. @thunderbird has been the go to for me for a long time. Since playing with Google Reader lifetimes ago.