http://www.md5decrypter.co.uk/
http://hash.db.hk/md5.php
Hashkiller.com
plain-text.info
insidepro.com
md5decrypter.co.uk
c0llision.net
md5pass.info
hashcrack.com
generuj.pl
authsecu.com
md5decryption.com
md5.rednoize.com
md5decrypter.com
md5crack.com
gdataonline.com
passcracking.com
cmd5.com
schwett.com/md5
milw0rm.com/md5
md5this.com
tmto.org
hashchecker.com
kerinci.net
hash.db.hk
crackfor.me
md5-db.de
md5hood.com
neofusion.de
xmd5.cn
md5.shalla.de
md5.my-addr.com
hashcracking.info <-- API: https://hashcracking.info/check.php?hash= {hash}
md5.opencracking.info
md5online.net
macrosoftware.ro/md5
netmd5crack.com
bokehman.com
md5-decrypter.com
hash-database.net
thoran.eu
md5-database.net
web-security-services.com
bitdelivery.net

Multi:
md5cracker.org
md5.igrkio.info
hashkiller.com
hashchecker.de
sinhalayo159.07x.net

IRC:
plain-text.info (irc.Plain-Text.info #rainbowcrack |||| irc.rizon.net #rainbowcrack)
md5.overclock.ch (irc.rizon.net #md5)
c0llision.net (irc.after-all.org #md5crack |||| ircd.hopto.org #md5crack)

ICQ:
c0llision.net (427-921-047) <- md5, ntlm
hashkiller.com (405-701-776) <- md5

LM:
lmcrack.com
plain-text.info