Hero Forge® is described as 'Hero Forge is a character creator which allows you to design high-resolution characters in 3D, right in your browser. It offers a genre-spanning library of thousands of parts, sliders, customization options, and color design tools, with fresh content added every week' and is a 3D Printing tool in the photos & graphics category. There are seven alternatives to Hero Forge®, not only websites but also apps for Windows, Linux, Steam and Mac. The best Hero Forge® alternative is MakeHuman, which is both free and Open Source. Other great sites and apps similar to Hero Forge® are DesktopHero, Anvl.co, Eldritch Foundry and Little You.
DesktopHero has a lot less options, but it's cheaper and it's digital-download version is free, making it very economical for 3d printing.