Game Character Hub is described as 'art program that is focused on game asset creation, especially RPG Maker's. It provides a built-in generator for character and tileset creation' and is an app in the Development category. There are three alternatives to Game Character Hub for Online / Web-based, Self-Hosted solutions, Steam, Windows and Mac. The best alternative is pixeldudesmaker, which is free. Other great apps like Game Character Hub are RPG Character Builder (Free) and Universal LPC Spritesheet Character Generator (Free, Open Source).
pixeldudesmaker is a free, web-based pixel art character generator for retro RPG, top-down and platformer games featuring a animations for idle, running and jumping and a randomizing to instantly create an original bitmap or animation.