Quidam is described as 'QUIDAM 3 for Mac reinvents character modeling to make it natural and productive' and is an app in the Photos & Graphics category. There are more than 25 alternatives to Quidam for a variety of platforms, including Windows, Mac, Linux, iPhone and iPad. The best alternative is MakeHuman, which is both free and Open Source. Other great apps like Quidam are ZBrush (Paid), Sketchfab (Freemium), VRoid Studio (Free) and MODO (Paid).
MakeHuman is an interactive modelling tool for creating realistic 3D human characters. These models can be exported to several computer graphics and animation platforms including Blender, Unity 3D, Unreal Engine, OpenSim and Second Life.
Sketchfab is the first web service to publish interactive 3D content online in real-time without plugins. Every new format has its global platform: videos have Youtube, photos have flickr, sounds have Soundcloud... Now 3D files have Sketchfab.
pixiv has released "VRoid Studio", a character maker that allows users to create, in easy steps, 3D model characters which can be used in various VR\AR platforms as well as the production 3DCG animation and games.
Rocket 3F is polygonal modeller created for Concept Artists and Designers. Modeling with Rocket 3F is like drawing - very Simple and Inspiring! The Most important feature of Rocket 3F is Workflow! It is Fast Fun and Friendly!
Silo Professional is the main version of Silo, which gives users access to everything Silo has to offer. This includes Silo's core modeling toolset, as well as advanced features for UV editing, displacement painting, re-topologization, and more.
MARI is a creative texture-painting tool that can handle extreme projects. MARI was developed at Weta Digital to handle the massively complex, highly detailed look development work demanded of the texture department by projects such as District 9, The Lovely Bones, and Avatar.