Plasticity is Open Source but NOT free. It is free during the BETA only. It will cost $25 for version 1.0 (no subscription).
Plasticity is a 3d modelling software for concept artists. Modelling in Plasticity is fast and efficient due to the unique menu system, shortcuts and thoughtful workflow.
Plasticity is currently in the early stages of development with many more features to add and bugs to resolve. The project is currently in need of Beta Testers who can find and report bugs.
Contact Nick Kallen [email protected] for a Discord community link.