zeroboot

Zeroboot spins up virtual machine sandboxes in under a millisecond using copy-on-write forking. That speed matters because agents need to spin up and tear down environments constantly, and traditional VMs take seconds to minutes.

Sub-millisecond means your agent can create a fresh isolated environment for every single command it runs. No leftover state, no risk of one task contaminating another. It's like giving your agent a brand new computer for every action.

Apache 2.0 licensed, Rust.

The catch: this is Linux-only (it relies on kernel-level VM features). No macOS, no Windows. The sub-millisecond claim is for the VM fork. Actual workload startup depends on what you're running inside. And the community is small. If you hit an edge case, you're likely on your own.