Alphabetized by title, and minimal formatting. Guess what the most popular house rule topic is?
If I missed any, reply in this thread. (Update: applied some formatting.) (Update 2: More cleanup, in process.)
Broken Links: Collector (thread, broken PDF link) by bzarhands
Acrobat (thread, Google Doc) by moorcrys
Adept (thread, blog) by CharlesDM
Adventurer (thread, blog) by TyWyll
Alternate Casters (thread, PDF) by Thomas Weigel
Argyrian Claviger (thread) by Baron Opal
Aristocrat (thread) by Thomas Weigel
Artificer (thread) by Thomas Weigel
Assassin Cleric (thread, blog) by jedavis
Atlantean Shadow (thread, blog) by James C. Bennett
Atlantean Stormtrooper (thread, blog) by James C. Bennett
Bard (no thread, blog) by koewn
Beastlord (thread, blog) by CharlesDM
Black Mage (thread, blog) by Tywyll
Brass Jongleur (thread, blog) by CharlesDM
Bravo (thread, blog) by Waiwode
Clerical Orders (thread, blog) by CharlesDM
Clerical Orders, Majestic Wilderlands (thread, blog) by LibraryLass
Diplomat (thread) by Thomas Weigel
Divine Elves (thread, blog, part 2, part 3, part 4, and part 5, plus spell list) by Tywyll
Draconic Apotheosis (thread, blog and wizard college) by CharlesDM
Drow Racial Value (thread) by CelticTony
Dwarven Cantor (thread, blog) by CharlesDM
Dwarven Muleskinner (thread, blog) by jedavis
Dwarven Paladin (thread, blog) by Tywyll
Elven Arcist (thread, blog) by Tywyll
Expert (thread) by Kiero
Fortune Hunter (thread, blog) by koewn
Geckoman race (thread, blog) by golan2072
Gnomish Arbalester (thread) by bzarhands
Gnomish Arbalestier (thread, blog) by CharlesDM
Goblin classes (thread, blog) by CharlesDM
God-Blooded Kylotean Hoplite (thread) by Memnon
God-Sparked Jotun (thread, blog) by Tywyll
Halfling (thread, MS Word) by creases
Halfling thread by Library Lass
Halfling Rover discussion (not a full class) (thread by Rhynn
Huntsman (thread) by todd
Illusionist (thread) by Beastman
Illusionist (thread) by Thomas Weigel
Inquisitor and Witch Knight (thread, blog) by CharlesDM
Jotun Juggernaut (thread, blog) by Tywyll
Lackey (thread) by DrSkull
Lizardman Race (thread, blog first draft, blog final draft) by golan2072.
Lizardman Gladiator (blog) (and thread) Lizardman Hunter (blog) (and thread) Lizardman Hunter, updated (blog)
Machinist (thread, blog) by CharlesDM
Mammu Race (thread) by Grubsnatcher
Mechanist (thread, blog) by golan2072
Mountebank (thread, Google Doc) by moorcrys
Mountebank Updated (thread, Google Doc) by moorcrys
Mystic variants (thread, blog) by CharlesDM
Necromancer (thread) by Thomas Weigel
Necromancer (thread) by DrPete
Nephani Sea Witch (thread, PDF, and PDF background) by harmyn
Nightmasks (thread, blog) by Tywyll
Northern Bear (thread, Google Doc) by Baileywolf
Ovatic Spellcaster (New Class Category) (thread, blog) by koewn
Paladin (thread, blog) by Tywyll
Priestess Covellia (thread) by Asaris
Racial Class Modifiers (thread, PDF) by Thomas Weigel
Savant (thread, Google Doc) by moorcrys
Sci-Fantasy Collection (Gunslinger, Tinker) (thread) by James C. Bennett
Slayer (thread, blog) by CharlesDM
Solitary (thread, blog) by CharlesDM
Sorcery caster type (thread, blog) by koewn
Sorcerer and Alternate Magic System (thread, blog) by Tywyll
Soul Knight (thread, blog) by Tywyll
Soul Knight, Revised (thread, blog) by Tywyll
Summoners (thread) by Thomas Weigel
Sword Mage Collection Unofficial (thread, PDF {does not include all of them}) by lots of people
Individual Entries: Deathdealer (blog) by CharlesDM Gnomish Enforcer (blog) by zapicm Half-Breed Spellsword (blog) by k-slacker Hyperborean Spellsword (blog) by k-slacker Martian Spellsword (Word Doc) by witness Mithril sorcerer (in PDF above, only), by Thomas Weigel Sword-Sorcerer (thread) by abpos Thrassian Dweomerclaw (Google Doc) by Taarkoth Warden (thread, blog) by Tywyll Warlock (blog) by k-slackerTemplar (thread, blog) by CharlesDM Tinmen (thread, blog, 2, and 3) by CharlesDM Valkyrie (thread, blog) by jedavis War Wizard (thread) by Thomas Weigel Warden, Redux (thread, blog) by Tywyll White Mage (thread, blog) by Tywyll Windwalker (thread) by Maticore Witch (thread) by Thomas Weigel Witches (thread, blog, 2, 3, 4, and magic college) by CharlesDM Wizard (thread, blog) by CharlesDM Wormpriest (thread, blog) by koewn Za'hir (Inspired by Sha'ir) (thread, blog entry, Google Drive PDF) by harmyn