I've heard alchemy from Blender Foundation's Chaos & Evolutions Open Movie Workshop on their free tutorial.
Image by J4son H4n
Alchemy is a software or a tool that let's you conceptualize the base of your character before put into details.
is an open drawing project aimed at exploring how we can sketch, draw, and create on computers in new ways. Alchemy isn’t software for creating finished artwork, but rather a sketching environment that focuses on the absolute initial stage of the creation process. Experimental in nature, Alchemy lets you brainstorm visually to explore an expanded range of ideas and possibilities in a serendipitous.
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Images by Nicolas Francoeur