Two dead-simple implementations in Ruby

ruby-celluloid-io/Gemfile

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+source 'http://rubygems.org'
+ruby "1.9.3"
+
+gem 'celluloid-io'

ruby-celluloid-io/Gemfile.lock

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+GEM
+  remote: http://rubygems.org/
+  specs:
+    celluloid (0.12.4)
+      facter (>= 1.6.12)
+      timers (>= 1.0.0)
+    celluloid-io (0.12.1)
+      celluloid (~> 0.12.0)
+      nio4r (>= 0.4.0)
+    facter (1.6.17)
+    nio4r (0.4.3)
+    timers (1.1.0)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  celluloid-io

ruby-celluloid-io/server.rb

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+require 'celluloid/io'
+
+class EchoServer
+  include Celluloid::IO
+
+  def initialize(host, port)
+    @server = TCPServer.new(host, port)
+    run
+  end
+
+  def finalize
+    @server.close if @server
+  end
+
+  def run
+    loop { handle_connection! @server.accept }
+  end
+
+  def handle_connection(socket)
+    loop { socket.write socket.readpartial(1024) }
+  rescue EOFError
+  end
+end
+
+EchoServer.new('127.0.0.1', 9000)

ruby-eventmachine/Gemfile

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+source 'http://rubygems.org'
+ruby "1.9.3"
+
+gem 'eventmachine'

ruby-eventmachine/Gemfile.lock

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+GEM
+  remote: http://rubygems.org/
+  specs:
+    eventmachine (1.0.0)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  eventmachine

ruby-eventmachine/server.rb

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+#!/usr/bin/env ruby
+
+require 'rubygems'
+require 'eventmachine'
+
+module EchoServer
+  def receive_data data
+    send_data data
+  end
+end
+
+EventMachine::run {
+  EventMachine::start_server "127.0.0.1", 9000, EchoServer
+  puts 'running echo server on port 9000'
+}