Misc:
#quakelive - official QL channel
#ql - unofficial QL channel
#esreality - ESReality
#qlranks - QLRanks
#qlstats.info - QLStats
#quakehistory - Quake History
#wolfcamql - Wolfcam QL
#radiant - GTKradiant
#maverickservers - Maverick Servers and Gaming

Pickups:
#tdmpickup - EU TDM pickup
#natdm.ql - NA TDM pickup
#ctfpickup - CTF pickup
#instagib.ql - Instagib pickup
#qlpickup.ca - CA pickup
#qlpickup.us - NA pickup (various)
#qlpickup.ru - Russian pickup (various)
#qlpickup.ua - Ukrainian pickup (various)

Organizations/Leagues:
#faceit - FACEIT
#125fps - 125 Frags Per Second
#hoqleagues - House of Quake
#clanbase.ql - ClanBase
#excello.quake - Excello
#adroits.quake - Adroits
#esl.quakelive - Electronic Sports League
#dreamhack.quake - Dreamhack
#esa - ESA Gamer

Streams:
#leveluptv - Level Up TV
#thegdstudio - The GD Studio
#holysh1t - holysh1t TV
#sadlytv - SadlyTV
#targetquake - Targetquake TV
#csn.ql - CyberSportsNetwork
#live.ql - LiveQL (list of live streams)

Players:
#stermy - Stermy
#k1llsen - k1llsen

Nations:
#ql.uk - United Kingdom
#ql.se - Sweden
#ql.cz - Czech Republic
#quake.pt - Portugal
#quake.sk - Slovakia
#quakelive.it - Italy
#quakelive.fi - Finland
#quakelive.dk - Denmark
#quakelive.hu - Hungary
#quakelive.at - Austria

TDM clans:
#sitto - sitto (TDM div 1)
#l0wfly - l0wfly (TDM div 1)
#102 - deliberate murder (TDM div 1)
#le.clan - lemmings effect (TDM div 1)
#planb.ql - PlanB (TDM div 1)
#action - aCtion Ligan (TDM div 1)
#play.q2 - play (TDM div 1)
#gentlemenclub - Gentlemenclub (TDM div 1)
#partyhard - Party Hard (TDM div 2)
#2k.clan - 2K (TDM div 2)
#skywakkah - Skywa1kers pojkar (TDM div 2)
#balalaika - balalaika (TDM div 2)
#evo.ql - Team Evolution (TDM div 2)
#fromage&champagne - CREME BRULEE (TDM div 2)
#40vol - 40 Percent Alcohol (TDM div 2)
#d9 - District 9 (TDM div 2)
#team-virus - Team viRus (TDM div 2)
#]wzj[ - Wir zocken Jetzt (TDM div 3)
#vertigo - Vertigo (TDM div 3)
#rbls.cz - Rebels (TDM div 3)
#funtastic - funtastiC (TDM div 3)
#mamut.si - Team Mamut (TDM div 3)
#pigs - Infected Gaming (TDM div 3)
#nhf - No Hard Feelings (TDM div 3)
#itrl? - is This real Life ? (TDM div 3)
#hoq - House of Quake (TDM div 3)
#contra - Contra (TDM div 4)
#knirt.tdm - KNIRT (TDM div 4)
#aim.tdm - aim (TDM div 4)
#dtr - Downtown Runtorz (TDM div 4)
#vo - Virtual owners (TDM div 4)
#[12] - Twelve Monkeys (TDM div 4)
#ffa-clan - Free For All (TDM div 4)
#[nsi] - No Skill Involved (TDM div 4)
#brainwashed.ql - brainWashed (TDM div 4/5)
#ztnteam - The Blood Runners (TDM div 5)
#clanchill - ChillZero (TDM div 5)
#druidz - Team Druidz (TDM div 5)
#sauer - sauer (TDM div 5)
#hoq.b - House of Quake (TDM div 5)
#utterlymad - utterly mad (TDM div 5)

CTF clans:
#sitto - sitto (CTF div 1)
#prosofpain - Pros of Pain (CTF div 1)
#discord - Discord (CTF div 1)
#spliff - spliff (CTF div 1)
#waw - we always win (CTF div 1)
#magic - magic (CTF div 1)
#sup? - whats going on (CTF div 1)
#hoq - House of Quake (CTF div 1)
#partyhard - Party Hard (CTF div 1)
#lkff - LKFF fun (CTF div 2)
#impressive-ql.de - imPreSs!ve (CTF div 2)
#awe-clan - Awesome Clan (CTF div 2)
#htf.qlctf - Happy Tree Friends (CTF div 2)
#[12] - Twelve Monkeys (CTF div 2)
#team-virus - Team viRus (CTF div 2)
#idsclan.it - Italian Death Squad (CTF div 2)
#hoq.b - House of Quake (CTF div 2)
#z1s.ql - Zombies in Space (CTF div 2/3)
#clan.kow - Knights of War (CTF div 3)
#itrl? - is This real Life ? (CTF div 3)
#ffa-clan - Free For All (CTF div 3)
#[nsi] - No Skill Involved (CTF div 3)

CA clans:
#idsclan.it - Italian Death Squad (CA div 1)
#faces.ql - faces of meth (CA div 1)
#camb! - Come at me bro! (CA div 1)
#krs - kill revenge Survive (CA div 1)
#partyhard - Party Hard (CA div 1)
#sexyladies - SexyLadies (CA div 2)
#oz.ql - outlawZ immortalZ (CA div 2)
#stickup - s7ickup Gaming (CA div 2)
#deadclan - deadclan (CA div 2)
#hoq.b - House of Quake (CA div 2)
#lethal - Lethal Gaming (CA div 3)
#cds - Czech Demolition Squad (CA div 3)
#pizdec4life - Pizdec 4 Life (CA div 3)
#[nsi] - No Skill Involved (CA div 3)

Instagib clans:
#pizdec4life - Pizdec 4 Life (Instagib)
#ven.ql - Venum (Instagib)
#syn - Synergy (Instagib)
#conkers - House of Conkers (Instagib)
#drunk - drunk clan (Instagib)
#ql-nc - NiCe ClaN (Instagib)
#s1lly - s1LLy (Instagib)
#bad_company - Bad Company (Instagib)
#ev| - Everlast (Instagib CTF)
#7 - seven (Instagib CTF)
#ql-8 - Crazy Eight (Instagib CTF)
#gha - group holding authority (Instagib CTF)
#qplet - qplet (Instagib CTF)
#in$ta - InstaGib (Instagib CTF)

FT clans:
#clanchill - Chill clan (Freeze Tag)
#zmb - Living Dead (Freeze Tag)
#squad - SQUAD (Freeze Tag)
#pizdec4life - Pizdec 4 Life (Freeze Tag)

Other clans:
#n00b3gg5 - n00b3gg5
#33rd - 33rd Degree

Quake 3 Communities:
#cpma.na
#cpmduel
#cpmpickup
#defrag
#promode
#promode.ru
#uscpmpickup