How to Install 9Router on Ubuntu 24.04

9Router is an open-source LLM gateway built for AI coding agents. It connects Claude Code, Codex, Cursor, Cline, Copilot, and Antigravity to 40+ free AI providers, giving you unlimited coding sessions without hitting rate limits. Smart auto-fallback routes every request across providers, RTK mode cuts token usage by up to 40%, and a clean web dashboard gives you full control over routes, API keys, and provider health.