The best Web Server alternative to Socket.io is TrailBase, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to Socket.io and four of them are Web Servers so hopefully you can find a suitable replacement. Other interesting Web Server alternatives to Socket.io are Jetty, SignalR and Mako Server.
TrailBase offers a blazingly fast, open-source application server featuring type-safe APIs and real-time data. Built on Rust, with JS/ES6/TS runtime, it provides built-in authentication, admin UI, and low-latency responses. Supports mobile, web, and desktop, eliminating the need for dedicated caches.
The Jetty Web Server provides a HTTP server and Servlet container capable of serving static and dynamic contend either from a standalone or embedded instantiations.
Compact web and app server featuring Lua scripting, built-in app framework, SQLite database, async sockets, WebSocket support, SMTP, MQTT, OPC-UA, Modbus, SMQ broker, automated Let's Encrypt TLS, and instant start on multiple operating systems.
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