Localisation for v3.x and v2.x:
French: Eric Schweichler
Japanese: Hideki Inoue
Latin American Spanish: Kevin López Brante
Custom character sets:
Circlex, Filament, Diet PETSCII and Retrotech Romance
by Ray Manta / DataDoor
Gloop
by Polyducks
PixelCod 8x8
by PixelCod
Rook
by Quintin Stokes
Cozette
by slavfox
Custom palettes:
DawnBringer 8, 16, 32 & ISO22
by Richard Fhager
C64 Pepto
by Philip "Pepto" Timmermann
Arne 4, 16, 64, CGArne, Eroge Copper, Famicube, Generic 8 Color, & ZXArne
by Arne Niklas Jansson
Matriax8c
by Davit Masia
HeroHoop
by Mate Cziner
ARQ4, ARQ16, EN4, EDG8, EDG16, EDG32, ENOS16, EDG36X, EDG64 & SOFT 16
by ENDESGA
Nurnie greebles
by Mrs Nurnie Greebles
Almost mono, Mr Bumpkins & Jolly Xanthic Quartet
by Stefan "Coja" Bogdanovic
AAP-16, AAP-64, Micro12, SimpleJPC-16, Splendor128 & RadiantXV
by Adigun Azikiwe Polack
Arcade Standard 29, GB Chocolate, GB Grapefruit, Generic 15, Linear Color Palette Basic, Nature's Embrace 55, Oil 6 & Sweetie 16
by Grafxkid
Fleja Master Palette
by Fleja
Ice Cream GB, Island Joy 16, Mist GB, Nymph GB, Peachy Pop 16, Rustic GB & Wish GB
by Kerrie Lake
Fantasy 24
by Gabriel Cortabraz
Castpixel 16 (PV8)
by castpixel
FZT Ethereal 16, Turd32 & SYZ15
by Fusionnist
JB4 & Haretro8
by haretro.com
Pear36, Bubblegum16, Taffy 16, Rosy 42 & Pineapple 32
by PineTreePizza
Juice32
by Realjuice_dev
Vine's Flexible Linear Ramps
by VINE2D
Zughy 32
by _Zughy
Lux2K
by thisislux
At the End, The Lost Kittings & Mad Doc
by Andylittle
Kells 12 & Japanese Woodblock
by Polyducks
Crrackerjack 4
by crrackerjack
UFO 50
by 50games.fun
Fantastic 8 & Westmost 8
by Retrosaur
Tranquil Fantasy 23
by windfallapples
Tūī 15
by jeremy
jok_autum15 (+yellow)
by jok jokov
DRZ15A
by Drazile
Fantasy 16
by Brettybooop
Kirby 15
by SnugBoat
SOFTY 15 & EGGY 15
by Eggy
Summer Dream
by maruki
Nevercreature 15
by Nevercreature
Ridley126 15
by Ridley126
MORD15
by Mordfikosz
Equpix15
by Exidelo
Impromptu-15
by Repreang
Pixelwave, Holy Light, Firestorm, Afternoon & Moonlit-39
by Julian - @theartistjulian
Acid 15
by pyrometal
Oh hell, pastel 15
by StarlitSunset
QUICK15
by Reo
Magic 15
by CuriousBeefJerky
Axol15
by Axolotl
Vinik24
by Vinik
Retro Soda
by Nikkie Arts
Everything else (including the bugs)
by John Parker