# Open source sandboxes

There are 8 open source in the index.

8 sandbox providers. Also on the [web page](https://agentsandboxes.fyi/global/online/category/open-source).

## Sandbox providers

1. [E2B](https://agentsandboxes.fyi/global/online/e2b.md), Code execution, Online: Firecracker microVM sandboxes for agent-generated code, with pause/resume and filesystem snapshots.
2. [Cua](https://agentsandboxes.fyi/global/online/cua.md), Computer use, Online: MIT-licensed computer-use containers for agents: Lume macOS and Linux VMs plus Docker workspaces.
3. [Judge0](https://agentsandboxes.fyi/global/online/judge0.md), Open source, Online: GPL-3.0 code-execution engine covering more than 70 languages; self-host it or use the hosted service.
4. [Microsandbox](https://agentsandboxes.fyi/global/online/microsandbox.md), Open source, Online: Open-source libkrun microVM sandbox server, plus a cloud metered in computer-hours.
5. [Steel](https://agentsandboxes.fyi/global/online/steel.md), Browser sessions, Online: Apache-2.0 browser API for agents (steel-browser), with hosted sessions and stealth mode.
6. [OpenSandbox](https://agentsandboxes.fyi/global/online/opensandbox.md), Open source, Online: Apache-2.0 open sandbox platform for agent workloads, with container isolation on Docker or Kubernetes.
7. [Piston](https://agentsandboxes.fyi/global/online/piston.md), Open source, Online: MIT-licensed code-execution engine with a free public API, run per job in resource-limited sandboxes.
8. [ForeverVM](https://agentsandboxes.fyi/global/online/forevervm.md), Code execution, Online: MIT-licensed stateful Python machines that never expire; idle machines swap to disk and resume on demand.

## Other categories in Online

- [Code execution](https://agentsandboxes.fyi/global/online/category/code-execution.md): 19 sandbox providers
- [Dev environments](https://agentsandboxes.fyi/global/online/category/dev-environments.md): 8 sandbox providers
- [Browser sessions](https://agentsandboxes.fyi/global/online/category/browser.md): 3 sandbox providers
- [Computer use](https://agentsandboxes.fyi/global/online/category/computer-use.md): 2 sandbox providers
- [Evals and RL](https://agentsandboxes.fyi/global/online/category/evals-rl.md): 2 sandbox providers

> **Check before you choose.** Vendor specs and prices change. Follow the cited source on each listing before you pick a provider.