wsbcast does one thing: every client that connects gets a WebSocket, and anything one client sends gets broadcast to every other connected client. That’s it — no rooms, no auth, no protocol beyond “send a message, everyone else gets it.” Useful as the one shared component that lets otherwise-separate web apps know about each other in real time, just by opening a socket to it.
Built on Qt/C++, qmake && make release to build it, and it ships with a tests/ folder of plain HTML files — open three browser tabs, reload one, and watch the message show up in the other two consoles.