I’ve been using this a few months and recommend it as well. It’s serviceable but feels a bit janky. Scrolling and switching between view styles tends to leave black boxes on my device, and the UI doesn’t always disappear while scrolling. But I’d still recommend it for how light and fast it is on top of being FOSS
librera
Librera Reader (Book and PDF reader) https://f-droid.org/packages/com.foobnix.pro.pdf.reader/
I’ve been using this a few months and recommend it as well. It’s serviceable but feels a bit janky. Scrolling and switching between view styles tends to leave black boxes on my device, and the UI doesn’t always disappear while scrolling. But I’d still recommend it for how light and fast it is on top of being FOSS