Proliferate is an open-source, self-hostable alternative to GitHub Copilot that lets you run codex-style agents on your own infra. This matters because it removes vendor lock-in and cloud costs for teams already running LLMs in production—you can now ship the same “issue-to-merge” automation on-prem or in your VPC without sending telemetry or code off-cluster. Expect lower latency, tighter compliance, and the ability to fine-tune the agent on your private codebase, but you’ll need to budget GPU cycles and ops time to keep it running.