OpenSandbox

OpenSandbox is an Apache 2.0-licensed sandbox layer aimed at developers building agentic AI systems that need to execute untrusted code, run shell commands, drive browsers, or host coding agents like Claude Code and Gemini CLI. It handles the full sandbox lifecycle - provision, monitor, renew, pause/resume, terminate - and exposes in-sandbox primitives such as shell execution, file management, code interpreters, port forwarding, and log/metric streaming across both Docker and Kubernetes runtimes.

It slots into the same niche as E2B, Daytona, and Modal sandboxes, but leans harder on the self-hostable, framework-agnostic angle. SDKs ship for Python, JavaScript/TypeScript, Java/Kotlin, Go, and C#/.NET, which is unusually broad for this category and signals the team is courting enterprise backends, not just Python notebooks. Because the project is open source, the headline price is zero if you run it yourself; managed pricing is not advertised on the landing page.

The most likely buyers are teams shipping coding agents, RL training loops, or browser-automation agents who need a hardened execution layer they can audit and host inside their own VPC. If you only need an ephemeral REPL for an LLM and are happy with a hosted SaaS, lighter options exist.