Game Character Hub - helper program for game design (RPG Maker XP/VX and more)
Unity - The multiplatform game creation tools for everyone.
pixeldudesmaker - Simple, web-based pixel art character generator.
Godot Engine - Feature-packed 2D and 3D open source game engine.
RPG Character Builder - Create thousands of unique character sprites for your 2D game project - free!
Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.