Notes:

I do not claim that any of these translations are done by myself. This is purely an archive so that anyone can find the appropriate links for each & every SAO side story. This archive is kept up to date at all times, so please do bookmark this page!
Massive appreciation to all the amazing SAO translators that have been archived here:
- gsimenas & gang from dreadfuldecoding.blogspot.com
- Tap Trans from taptaptaptaptap.net
- Team Defan from defan752.wordpress.com
- SAO Archive Team from sao-archive.maamue.de
​For accessing the sao-archive.maamue.de sites, the username is 'sao' & the password is 'Alicization'.
What to know the chronological timeline of the whole SAO Aincrad arc?
Checkout my SAO Complete Aincrad Arc Timeline with information such as the priority of reading each story, the current floor, the current date, Kirito's current level, and more!

Pre-SAO Stories
SAO: The Beginning - Prologue:

Material Editions & mid-ME extras
Material Edition 1 (The Progressors):
Material Edition 2 (Early Characters):
Material Edition 3 (Ceramic Heart):
Material Edition 4 (Cold hand, Warm heart):
Material Edition 5 (Salvia):
Material Edition 6 (Algade Showdown):
Material Edition 7 (Continuation: Area in the Starless Night - aka 'A Reason For The Whiskers' from SAO Progressive 1 section 2) [Recommend just reading the official light novel]:
Material Edition 8 (Rondo of the Transient Sword Chapter 1 - from SAO Progressive 1 section 3) [Recommend just reading the official light novel]:
Material Edition 9 (Monochrome Concerto Chapter 1 - from SAO Progressive 2) [Recommend just reading the official light novel]:
Material Edition 10 (Sugary Days 1/16.6):
Material Edition 11 (Sugary Days 2/16.7):
Material Edition 12 (Sugary Days 3/16.8):
16.8.5 (Material Edition 12.5/Sugary Days 3.5):
Material Edition 13 (Sugary Days 4/16.9):
Material Edition 14 (Sugary Days 5):
Material Edition 15 (Sugary Days 6):
Material Edition 16 (Sugary Days 7):
Material Edition 17 (The Much-Talked-About Esteemed Sub-Leader):
Material Edition 18 (Sugary Days 8):
Material Edition 19 (Sugary Days 9):
Material Edition 20 (Monochromatic Colours/Chromatic Colours 2):
SAO Progressive 4.1:
Material Edition 21 (SAO Progressive 4.2):
Material Edition 22 (Augmented Magic - Original draft of SAO 21: Unital Ring prologue) [Non-canon]:
Material Edition 23 (Sugary Days 10):
Material Edition 24 (Sugary Days 11):
Material Edition 25 (Sugary Days 12):
Material Edition 26 (Sugary Days 13):
Material Edition 27 (Sugary Days 14):
Sugary Days Compilation Epilogue:
Material Edition 28 (SAO Gaiden X3 [32/33]/If You Were Here Parts 1-3 - full IF story in Alicization Arc - Cake/Crab Timeline Spin-Off section below):
Material Edition 29 (SAO Gaiden X3 [32/33] ②/If You Were Here Parts 3-5 - full IF story in Alicization Arc - Cake/Crab Timeline Spin-Off section below):

Aincrad arc Stories
Defence/Defensive Power:
Agil and Klein's Exciting Meal:
Lisbeth Edition (Sound of Water, Sound of Hammer LN):
Story Pencil Board:
Pina Edition (The Fourteenth Autumn LN):
The Day Before (SAO Season 1 BD Bonus LN - Now published in SAO 22) [Recommend just reading the official light novel]:
Lisbeth Edition ([Non-canon] Extraordinary Ordinary Days manga):
Silica Edition (The Final Promise manga):
Pina Edition (Pina Edition Bonus Manga Theatre manga):
Breaking the Damage Limit:
[Non-canon] SAO Comic Anthologies (manga) New story: Cops & Robbers Online!

Post-Fairy Dance Arc To Pre-Mother's Rosario Arc Stories
The Celeste Fairy:
The Day After (SAO Season 1 BD Bonus LN - Now published in SAO 22) [Recommend just reading the official light novel]:
Cooking with the Wife:
Rainbow Bridge (SAO Extra Edition BD Bonus LN - Now published in SAO 22) [Recommend just reading the original light novel]:
VRMMO Development Tragedy:
[Non-canon] Calibur SS (SAO Season 2 Calibur Alternative Ending):
Silica Edition (A Spot Of Sunshine In The Winter LN):

Yuuki/Asuka Empire Stories
Sister's Prayer (SAO Season 2 BD Bonus LN - Now published in SAO 22) [Recommend just reading the original light novel]:
Chromatic Colours (Sword Art Online abec Artworks Book exclusive story) [Recommend reading the official English translated Artwork Book]:
Sword Art Online Alternative: Clover's Regret V1 LN (Spin-off series in VRMMO Asuka Empire - Not yet officially translated and released in English, but V1 has been fan translated - V2&3 not yet fan translated):

Eiji/Ordinal Scale Stories
Hopeful Chant (Pre-Ordinal Scale - SAO Ordinal Scale Theatre Bonus LN):
Cordial Chords (Post-Ordinal Scale - SAO Ordinal Scale BD Bonus LN):

Alicization arc Stories
Summer Memories (Walde Farm, Zakkaria):
Distant Journey (Post-Zakkaria, Pre-Swordcraft Academy - SAO Alicization BD Bonus LN):
[Non-canon] There is But One Ultimate Way (Post-Alicization):
The End of the Summer and the Straw Hat (Post-Alicization):

Alicization Arc - Cake/Crab Spin-Off TIMELINE Stories
If You Were Here (SAO Alicization BD Bonus 2 LN):
Prismatic Colours (Sword Art Online abec Artworks Wanderers Book exclusive story - Takes place inbetween part 1 & 2 of If You Were Here):
If You Wish It (SAO Alicization -War of Underworld- BD Bonus LN):
If We Could Walk Together (SAO Alicization -War of Underworld- BD Bonus 2 LN):

Non-canon Crossover Stories
Versus (SAO X Accel World Crossover):
Dream Game -Crossover- (SAO X The Irregular At Magic High School Crossover):
Versus II (SAO X Accel World X The Irregular At Magic High School Crossover):

Character Books
Note: All Interviews Include Spoilers Up to SAO LN VOlume 18
Character Book Vol.1 Kirito:
Character Book Vol.2 Asuna:
Character Book Vol.3 Leafa:
Character Book Vol.4 Sinon:
Character Book Vol.5 Liz & Silica:
Character Book Vol.6 Alice:

Web novel popularity contest Q&A (2005)
Note: Answers based on the web novels (pre-light novels) & include spoilers up to SAO LN 9
Kirito Section:
Heathcliff & Kunori Sections:
Yui & Asuna Sections:
Sinon, Leafa & Yuuki Sections:
Lisbeth, Agil, Klein & Silica Sections:
All Other Character Sections: