| Name | Lines of code | Maintainability | Test coverage |
| lib/em/protocols/smtpclient.rb | 210 | B 5 hrs | |
| lib/em/protocols/smtpserver.rb | 319 | D 2 days | |
| lib/em/protocols/socks4.rb | 43 | ||
| lib/em/protocols/stomp.rb | 97 | B 4 hrs | |
| lib/em/protocols/tcptest.rb | 21 | ||
| lib/em/pure_ruby.rb | 863 | F 3 days | |
| lib/em/queue.rb | 44 | A 35 mins | |
| lib/em/resolver.rb | 187 | A 2 hrs | |
| lib/em/spawnable.rb | 42 | A 25 mins | |
| lib/em/streamer.rb | 66 | A 3 hrs | |
| lib/em/threaded_resource.rb | 29 | ||
| lib/em/tick_loop.rb | 45 | A 35 mins | |
| lib/em/timers.rb | 32 | ||
| lib/em/version.rb | 3 | ||
| lib/eventmachine.rb | 527 | F 4 days | |
| lib/jeventmachine.rb | 226 | A 35 mins | |
| win_gem_test/package_gem.rb | 13 |