Smallchat
A minimal programming example for a chat server
...The project shows how you can build a working chat server (accepting clients, broadcasting messages) in very few lines of C, without heavy libraries or frameworks—essentially minimal code, minimal dependencies, and minimal feature-set to illustrate the core concepts. It uses the simplest assumptions (for example: clients connect via telnet or netcat, line-based I/O) and keeps the message logic straightforward: each received line from one client is broadcast to all others (fan-out). The focus is not on robustness, feature richness or production readiness, but on learning how to write a non-trivial C program, handling sockets, multiplexed input (select/poll), client state, and basic formatting.