sish is a production-grade, self-hosted SSH reverse tunneling server written in Go. It acts as a multiplexer that accepts SSH connections and forwards HTTP(S), WebSocket, TCP, and TLS (SNI) traffic to local services. Unlike ngrok or serveo, sish requires no custom client—users connect with standard SSH remote port forwarding. The server listens on SSH (default 2222), HTTP (80), and HTTPS (443) ports, and uses unix sockets for internal routing. It supports load balancing, TCP aliases, custom domains via DNS verification, on-demand Let's Encrypt certificates, and a real-time web console for inspecting forwarded requests. The architecture is monolithic but highly concurrent, leveraging goroutines and syncmap for state management. The codebase is well-structured with clear separation of concerns: SSH multiplexing (sshmuxer), HTTP handling (httpmuxer), and shared utilities (utils). It includes integration tests for authentication key requests and connection cleanup. The project is actively maintained with regular releases, CI/CD pipelines, and comprehensive documentation.