Blender 3D and Makehuman are fantastic opensource 3D programs.
Blender 3D is the leading opensource (thus free) 3D modelling, rendering and animation program. It easily rival high-end commercial packages. It can even output models for 3D printing.
Makehuman is an opensource 3D human creation program. It can be used to create human characters ranging from children to elderly adults of both sexes.
The combination of Blender 3D and Makehuman can be used to create realistically rendered and/or animated digital humans of both male and female types.
Studiorola offers customised 3D modeling and related consultation and training to companies and individual who seek an opensource alternative to producing human character-based artworks.
Video below illustrates the generic workflow.