Alternatives to AX

LangChain's low-level agent orchestration runtime: durable graphs, streaming, human-in-the-loop, and persistence. About 39,835 GitHub stars.

Google's agent SDK in Python, Java, Go, and TypeScript. Docs now live at google.github.io/adk-docs. A2A is a separate protocol repo.

Firecracker microVM sandboxes for AI agents. Hobby is $0 plus usage; Pro is $150/month. Open-source SDK on GitHub.

Daytona is now a closed-source sandbox cloud. GitHub is archived. Starter $20, Plus $200, Scale $500, plus compute after included credits.

AWS's batteries-included agent harness: one import gives you a tuned general-purpose agent that the team says runs 28 percent cheaper than Claude Code.