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HeaderAndContent [Built-in]
SMTPServer [Built-in]
Stomp [Built-in]
Socks4 [Built-in]
ObjectProtocol [Built-in]
SASLauth [Built-in]
LineAndText [Built-in]
LineText2 [Built-in]
HTTPClient [Built-in]
HTTPClient2 [Built-in]
AMQP http://github.com/tmm1/amqp
MySQL https://github.com/brianmario/mysql2/blob/master/lib/mysql2/em.rb
http://github.com/tmm1/em-mysql (unmaintained)
http://github.com/igrigorik/em-mysqlplus (unmaintained)
SMTP [Built-in]
http://github.com/yakischloba/em-mailer
Postgres [Built-in]
https://github.com/royaltm/ruby-em-pg-client
http://github.com/jtoy/em-postgres
http://github.com/mperham/em_postgresql [ActiveRecord]
https://github.com/leftbee/em-postgresql-adapter
MemCache [Built-in]
http://github.com/astro/remcached
http://github.com/cliffmoon/eventedcache
http://github.com/cvillecsteele/evented-memcache-client
https://github.com/mperham/dalli
http://github.com/mperham/memcache-client
XMPP http://github.com/tmm1/xmpp4em
http://github.com/sprsquish/blather
https://github.com/crapooze/em-xmpp
DNS http://github.com/astro/em-dns
http://github.com/astro/em-asyncns
http://github.com/mperham/em-resolv-replace
http://github.com/ibc/em-udns
PowerDNS http://github.com/martinemde/em-powerdns
WHOIS http://github.com/mikejarema/em-whois
ICMP http://github.com/yakischloba/icmp4em
XML Push Parser http://github.com/eventmachine/evma_xmlpushparser
Redis http://github.com/mloughran/em-hiredis
http://github.com/madsimian/em-redis
MongoDB http://github.com/tmm1/rmongo
http://github.com/bcg/em-mongo
CouchDB http://github.com/saivenkat/em-couchdb
Beanstalk https://github.com/igrigorik/em-jack
SNMP http://github.com/normelton/snmp4em
HTTPRequest http://github.com/igrigorik/em-http-request
HTTPServer http://github.com/eventmachine/evma_httpserver
PubSubHubbub http://github.com/igrigorik/PubSubHubbub
Proxy http://github.com/igrigorik/em-proxy
http://github.com/mojombo/proxymachine
WebSocket http://github.com/igrigorik/em-websocket
SMPP http://github.com/augustzf/ruby-smpp
RPC http://github.com/oleganza/emrpc
https://github.com/dougbradbury/rubarb
IRC http://github.com/Sutto/marvin
https://github.com/IRCRuby/ircd_slim
https://github.com/flowdock/oulu
Spec http://github.com/tmm1/em-spec
Cassandra https://github.com/twitter/cassandra
Thrift http://github.com/twitter/thrift_client
Solr http://github.com/mwmitchell/rsolr-async
Syslog http://github.com/melito/em-syslog
Amazon S3 http://github.com/peritor/happening
http://github.com/nulayer/uber-s3
OSCAR (AIM, ICQ) https://github.com/devmod/em-oscar
RServe https://github.com/crapooze/em-rserve
SSH https://github.com/simulacre/em-ssh
Serial Port https://github.com/railsbob/em-serialport