Dotpict - Easy and intuitive, mobile pixel art editor.
Synfig Studio - Just another WordPress site
Aseprite - Aseprite is an art program dedicated to the creation of pixel art.
Live2D Cubism - Live2D is the world's first drawing technology to enable 3D rendering of 2D images.
Creature - Creature 2D Skeletal and Mesh Animation Tool
Pixen - Pixen is a professional pixel art editor designed for working with low-resolution raster art, such as those 8-bit sprites found in old-school video games.