Sword Art Online Abridged by Something Witty Entertainment, season 1 was fantastic, but season 2 has been pretty flaccid.
Goblin Slayer Abridged by Grimjack is fantastic and takes the series in a very different direction. So far it just keeps getting better as it goes on, further refining the jokes.
Grimjack also did a My Hero Academia abridged, think it was called My Dumb Academia or something. I think they only did season 1, but it was fantastic. They are currently also working on a Demon Slayer Abridged but it wasn't for me.
Team Four Star is also still doing DBZ content, just not Abridged content exactly. It's a show called Cell in Hell, focusing on Cell... in HIFL, living with other villains like Raditz and Frieza.
Also by TFS is Hellsing Ultimate Abridged, but it was a bit too edgy for my taste.
These ones aren't really for me, but people do really like Code Ment (Code Geass Abridged) and 50% Off (Free! Abridged).
Technically, the English Dub of Ghost Stories could be considered an Abridged series because the dubbing staff was never given the script and had to just make up what they thought was going on, or so I've heard.
Oh, no. The Ghost Stories English dub was very much intentional. It was part of a package deal for ADV and were allowed to do with it as they pleased to market it.
SAOA is astounding simply because they took a flaming pile of shit with a Mary Sue edgelord with ZERO personality and actually turned him into a real character.
It's basically fans condensing series & dubbing over them, often rewriting plot lines to be more funny and flanderizing characters. DBZ: Abridged is a legit masterpiece, can't recommend it enough (though the first few episodes are a bit rough).