Add forkd: fork-from-warm microVM sandbox for AI agent fan-out loops · ai-boost/awesome-harness-engineering@94b324d · GitHub

- [Alibaba OpenSandbox](https://github.com/alibaba/OpenSandbox) — General-purpose sandbox platform for AI agents (8.7K+ stars, March 2026) with multi-language SDKs (Python, Java, TypeScript, Go, C#), unified APIs across Docker/Kubernetes runtimes, and support for secure container runtimes (gVisor, Kata Containers, Firecracker). Covers coding agents, GUI agents, agent evaluation, and RL training in a single abstraction layer — the most runtime-flexible sandbox option when you need to choose isolation levels per workload.