According to the Amazon page, it was written in conjunction between Rowling, British Library's curatorial team and essayists Steve Backshall, the Reverend Richard Coles, Owen Davies, Julia Eccleshare, Roger Highfield, Steve Kloves, Lucy Mangan, Anna Pavord and Tim Peake.
Fantastic Beasts and Where to Find Them (audiobook narrated by Eddie Redmayne and there is an awesome illustrated edition as well)
Quidditch Through the Ages (audiobook narrated by The Walking Dead's Andrew Linoln)
The Tales of Beedle the Bard (sadly not an audiobook version [yet])
Harry Potter Prequel (https://www.readanybook.com/ebook/harry-potter-the-prequel-565703; https://en.m.wikipedia.org/wiki/Harry_Potter_prequel)
Pottermore Presents (three ebooks consisting of JKR writings from Pottermore. You might hate it. It's just literally biographies about various people, places, and things. http://harrypotter.wikia.com/wiki/Pottermore_Presents)
Harry, A History (I'm sure there's more "fandom history" books out there, but this is the one I read and it's pretty extensive. It's written by Melissa Anelli, of The Leaky Cauldron)
...and the Cursed Child (haven't read this yet. Heard it sucks)
Illustrated Editions (I don't have any of these yet, but they seem amazing.
And here's some viewing material as well, if you're interested:
It's the same content as the 2017 book A History of Magic.
There is <em>a</em> version of the History of Magic available but I don't think it's the version.