New Web IDE in GitHub (connect over TCP/IP and Audio, RUN IT ONLINE)

For the wiznet, this is what I use:

function onInit() {
  // Ethernet Card
  SPI2.setup({ mosi:B15, miso:B14, sck:B13 });
  var eth = require("WIZnet").connect(SPI2, B10);
  eth.setIP();
  global.eth = eth;
  
  // Prevent reset
  function softreset() {
    clearInterval();
    clearWatch();
    Object.keys(global).forEach(function(n) {
      if(n!="onInit" && n!="Ethernet" && n!="Server" && n!="Socket" && n!="Serial" && n!="Pipe" && n!="LoopbackA" && n!="LoopbackB" && n!="eth" && n!="fullreset" && n!="reset") {
        delete global[n];
      }
    });
    console.log("Can't reset properly - we'd break the network. Use fullreset() instead.");
  }

  // Telnet Server
  require("net").createServer(function (connection) {
    connection.pipe(LoopbackA);
    LoopbackA.pipe(connection);
    LoopbackB.setConsole();
    if(!global.fullreset) {
      global.fullreset = global.reset;
      global.reset = softreset;
    }
  }).listen(23);
}

//save();

(Updated with Gordon's tip)