As a note, none of this stuff are "leaks", just releases from 2019 / 2020. Wanted to spread some awareness for stuff that I keep up on my GDrive's and Mega accounts. I used to post these links on a selection of Discord servers, but not that many people took note of it. Also, I haven't seen a lot of DSi stuff leak or release of the past few months, so I'm just doing my job now.

https://drive_google_com/drive/folders/1CP7HmY5jgEsO7LFgOjPxwE7fsQY0QBrM | Nintendo DS(i) Repository, contains a s##tton of NTR/TWL SDKs and tools, some conference documents, TMD's, DSiWare, and other neat stuff.
https://mega_nz/folder/RQ9whKgT#EmqUD96Ij5AalMoodZ7ZXw | Nintendo DSi Formatted NAND Archive, contains a bunch of DSi system NANDs that were contributed by several people, including some developer NANDs.
https://mega_nz/file/AAEkWI7S#Lj9oDz8pLWXjkaMEb6nOLT9ZLseHuaC6kWeOtiYYp7U | Early DSi IPL (1542), dumped on 31/05/2019.

(PS: Some stuff is new and was previously shared privately, some can be found with a Google search.)
(PPS: May contain a duplicate file here and there from time to time.)
(PPPS: Don't expect these archives to go anywhere soon, they'll stay up forever, so don't mass-download all of this for no reason.)

Have fun, boys.