I've been using Hoopla myself for the last few months, mainly for comics so far. My library gives me access to a ton of comics, including most of Titan's Dr. Who collections.
They've got a ton of Dr. Who audios on there for me too, including a few of the spin-offs, like Davros, one of the UNIT series, and a bunch of Jago & Litefoot.
I was just coming here to talk about that. I've been gradually discovering how much library content is available digitally through Hoopla, Overdrive, and the like, and I just did an inventory of the Who audios they have available on Hoopla. It seemed like a forbidding list at first, over 170 entries and no way to tell what series or sequences they belonged to, so I wrote down all the names and consulted the TARDIS Wiki, and I found they tend to constitute a variety of complete series/sets, less random than they appeared in the list. To sum up, they have:
The Main Range from 1999-2003, everything from The Sirens of Time through Zagreus
First Doctor Early Adventures Series 1
Fourth Doctor Adventures Series 1-2
Eighth Doctor Adventures Series 1-2
The Lost Stories Series 1-2 (including 1st & 2nd Box Set duos and 6th & 7th "seasons") and 4th Doctor Box Set
Philip Hinchcliffe Presents Vol. 1
Companion Chronicles Series 2-3
Short Trips Vol. 3 & 4 and Series 5
Destiny of the Doctor
The Stageplays
Cyberman Series 1-2
Dalek Empire Series 1-2
I, Davros
UNIT (except "The Coup")
The Worlds of Doctor Who
So anyway, I'm trying to decide what I want to try listening to and in what order -- like, whether to go for release order or chronological order. I'm leaning toward release order for the Main Range, since then I'd get to experience its evolution as a series, and I'd get a mix of different Doctors and companions. And my preference would be for the ones that are done full-cast rather than the ones that are mostly narration, though I might get around to the latter in time.
I did hear the first several Eight/Charley stories some years ago when the BBC put them online. I recall finding them mediocre, though I liked getting to know McGann's Doctor better. I recall hearing a Five/Nyssa audio once too, though all I remember about it is how old the actors sounded.