List of Free and commercial Pixel Art Tools

krousty_bat

Might be useful:

https://tmblr.co/Zfrycn1rw1VSI
(list bellow, but links on the page)

Free Pixel Art Tools:
Piskel [Windows/Mac + Browser]
Pixel Art Editor [Browser] -with collaborative editing mode-
Aseprite 0.95 [Windows/Mac/Linux]
Grafx2 [Windows/Mac/Linux]
Paint.NET [Windows]
GIMP [Windows/Mac/Linux]
Paint [Windows]
Pixly [Android]

Commercial Pixel Art Tools:
Photoshop [Windows/Mac]
Pro Motion [Windows]
Pyxel Edit [Windows/Mac]
Aseprite [Windows/Mac]
GraphicsGale [Windows]
Pixaki [iPad]
Sprite Something [iPhone/iPad]
Sprite Lamp [Windows/Mac/Linux]

krousty_bat

some other things to check

Tilemancer is a quick procedural tile creator designed for pixel-art games. Perfect for game jams, prototypes, texture mods, and more.
https://led.itch.io/tilemancer

SPARTAN Procedural Tile Generator
https://pnjeffries.itch.io/spartan-procjam-edition

Tiled is a free software level editor.
https://thorbjorn.itch.io/tiled
or
http://www.mapeditor.org/


and for because it might be usefull:
https://playcrafts.itch.io/palette-generator

krousty_bat

Paint of Persia: rotoscoping pixel-art tool
https://dunin.itch.io/ptop

The biggest list of game development resources on the web.
https://game-development.zeef.com/david.arcila
Lots and lots of links here.

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and a tutorial
Creating PixelArt
http://pixeljoint.com/forum/forum_posts.asp?TID=11299