Birds of Paradise is a supplement by Florian Emmerich and Katrina Bresnick, introducing 12 new subraces for Aarakokra and Kenku, as well as a few more things such as spells, NPCs, and even a custom character sheet.
Palms Passing Parcel & Logistics Guild is a 22-page supplement for 5th Edition by Ryan Hennessy, introducing a new organization that is active all over Faerun. It has a little bit of everything – lore, items, plot hooks, et cetera.
Feats Don’t Fail Me Now is a humorous supplement for 5e by Gordon McAlpin, M.T. Black, Andrew Cawood, Jeremy Forbing, Chris S. Sims, and Laura Hirsbrunner. As you can guess from the name, it is a collection of 42 (plus one more) feats – although they aren’t exactly what you might expect.