Tree Sandbox is described as '"Tree-shaped" sandbox: multi-layer nesting and branching, like a “tree” composed of multiple sub-containers. A sandbox is composed of multiple layered sub-containers. With this design, “untrusted” procs and “semi-trusted” procs run in different layers of a sandbox;' and is an app. There are more than 10 alternatives to Tree Sandbox for a variety of platforms, including Linux, Windows, Mac, Web-based and Self-Hosted apps. The best Tree Sandbox alternative is Docker, which is both free and Open Source. Other great apps like Tree Sandbox are Sandboxie Plus, Flatpak, Podman and Windows Sandbox.