Here is a list in game. I can replace the guild leaders names with other contacts if they would like.
<Nostalgia> Leader: Zaren
<Crash> Leader: Murphy
<Shining Force> Leader: Terethian
<Quiet Storm> Leader: Justin
<Transcendence> Leader: Tibador
<Symphony of Brotherhood> Leader: Snarla
<Divinity> Leader: Daydrem
<Crimson Coalition> Leader: Seth
<Slightly Tweaked> Leader: Slightly
<Bregan D`Aerth> Leader: Sanluen
<Forceful Entry> Leader: Blink
<Order of the Stick> Leader: Flint
<Domingueros de Norrath> Leader: Mascleta
<Society of Norrathian Explorers> Leader: Ivvl
<Dark Aegis> Leader: Blugrog
<Infectus> Leader: Thorian
<Shades of Fury> Leader: Doraf
<Ancients> Leader: Shocky
<Inglourious Basterds> Leader: Crow
<Europa> Leader: Charmis
<Lads> Leader: Sweet
<Emo Kids> Leader: Ektar
<Inquisition> Leader: Casanova