Here's a free tool for creating and painting organic shapes in 3D.
A Computer Programmer and Software Developer Karlay Souza has created a great sculpting tool that can be used as a cheaper alternative to ZBrush. Check out Meshmolder, a tool for digital sculpting that can be used to create and paint organic shapes in 3D, with functionalities for creating characters for games, films, and general arts. With Meshmolder, you are able to manipulate thousands of polygons.
In addition to organic meshes, Meshmolder can create hard surfaces and allows you to develop whatever your imagination can achieve. The tool is also capable of capturing Polypaint paint from files created with ZBrush and saved in .obj format. Meshmolder also captures Normal Maps and Ambient Occlusion Maps, making it easy to keep small details on game characters.