is an open-source, cross-platform package manager designed to create isolated, reproducible environments for software packages. Unlike traditional package managers (like apt or pip ) that install software directly into a system environment, Rez manages packages in a central repository and resolves dependencies dynamically at runtime.
When a user requests a tool (e.g., rez env maya-2025 ), Rez creates a temporary, lightweight environment that links to the necessary libraries. is an open-source
Rez is used by various studios in the Animation and VFX industry and is part of the Academy Software Foundation (ASWF) . rez env maya-2025 )