Avatar: The Last Airbender Trading Card Game (2006).
Ruins of the Empire (2019≢020) - A trilogy that focuses on rebuilding the Earth Kingdom in the wake of the events of Book Four.
Turf Wars (2017≢018) - A trilogy that focuses on Korra and Asami's relationship and the repercussions of the series finale.
Toph Beifong's Metalbending Academy (2021).
Team Avatar Tales (2019) - An anthology that collects Rebound, Shells, and Sisters, in addition to new, original stories.
Imbalance (2018≢019) - The Gaang deals with technological progress in a small town, and its effect on benders and non-benders alike.
North and South (2016≢017) - Katara and Sokka return home for the first time after the war, and finds out that some things have changed.
Smoke and Shadow (2015≢016) - Zuko deals with a rebel faction of Fire Nation citizens calling themselves the "New Ozai Society.".
The Rift (2014) - Aang receives visions of Avatar Yangchen (the previous Air Nomad avatar), and deals with the celebration of an Air Nomad holiday held in her honour.
The Search (2013) - The fate of Princess Ursa is revealed, tying up one of the biggest loose threads of the original series.
The Promise (2012) - A trilogy that picks up immediately after the end of the series, and deals with Zuko's struggles after the war.
All but two ("New Recruits" and "Gym Time") are considered canon by Word of God.
The Lost Adventures (2011) - A digest graphic novel which includes the out of print Expanded Universe strips first published in Nick Magazine and DVDs of Avatar: The Last Airbender.
An Avatar's Chronicle (2019) - A scrapbook covering Korra's experiences throughout her early time as the Avatar, to serve as a guide for her successor.
Endgame (2013) - Novelization of the second half of The Legend of Korra Book One.
Revolution (2013) - Novelization of the first half of The Legend of Korra Book One.
Legacy of the Fire Nation (2020) - Uncle Iroh's memoir, left to Zuko.