Self-hosted dev sandboxes with preview URLs (Docker, Go, no K8s)

Sandboxd is an open-source, self-hosted platform that allows users to build and run applications in isolated Docker containers accessible via preview URLs, either by prompting an AI coding agent or launching pre-built open-source apps. Built with Go and Docker (no Kubernetes required), it offers both an API-first approach and optional web console, giving users full control over their infrastructure, code, and data. The platform supports 80+ curated applications and can run any Node, Python, or static-binary app with a simple one-line installation.