
TexturePacker
Sprite Sheet Animator
Sprite Sheet Packer
Cyotek Spriter
Stitches
ShoeBox
Sprite Monkey
OpenGameArt.org
TextureLab
Material Maker
Substance Designer
PixaFlux
Filter Forge
Substance Alchemist
TextureWorks
TexGraph
TexturePacker
TextureLabSprite Sheet Animator - Have a sprite that you want to show off?
Material Maker - Cross-platform, procedural texture generation tool.
Sprite Sheet Packer - Sprite Sheet Packer is online that you can easily use to pack sprite sheets, including data formats for CSS, LESS, and Phaser.
Substance Designer - Substance Designer is a node-based non-destructive application for material authoring.
Cyotek Spriter - Cyotek Spriter is a popular tool that creates sprite sheets and dynamic text effects for games, HTML, tool strips, HTML, and many more.
PixaFlux - PixaFlux is a node based image processing application.