For reasons, I'm trying to compile together some lists of all the official game-able things that have appeared in each edition, with sources: races, classes, monsters, magic items, spells, etc. Figured I'd share some of the lists I've found so far, in the hopes that a) others would find this useful and b) others might be able to provide better lists, or fill in some of the gaps...
Multiple categories
Consolidated Lists (3E only, official)
D&D 5E - 5e Lists of Monsters, Spells, Races, Feats, Etc. (5E only (but very extensive), includes 3P, shout-out to @MechaTarrasque)
Races
List of character races in Dungeons & Dragons (originally from Wikipedia, all editions)
DragonDex - Index of Articles (up to 3E, Dragon Magazine only)
List of BECMI/RC Classes (BECMI only)
Race (4E only)
Character Races for Dungeons & Dragons (D&D) Fifth Edition (5e) - D&D Beyond (5E only)
Classes
Character class (all editions, core only)
DragonDex - Index of Articles (up to 3E, Dragon Magazine only)
List of BECMI/RC Classes (BECMI only)
Lists of Dungeons & Dragons classes (3E, 4E, 5E only)
List of alternative Dungeons & Dragons classes (originally from Wikipedia, includes character kits, all editions)
Classes Index :: d20srd.org (3.5, SRD only)
List of prestige classes (originally from Wikipedia, 3E only)
Subclass (4E only)
Character Classes for Dungeons & Dragons (D&D) Fifth Edition (5e) - D&D Beyond (5E only, includes unofficial Critical Role content)
Classes Index :: 5e.d20srd.org (5E, SRD only)
Themes
Character theme (4E only)
Backgrounds
Character Backgrounds for Dungeons & Dragons (D&D) Fifth Edition (5e) - D&D Beyond (5E only)
Skills
Compiled Proficiency List (2E only)
Skills Index :: d20srd.org (3.5, SRD only)
Skills Index :: 5e.d20srd.org (5E, SRD only)
Feats
DragonDex - Index of Feats and Flaws (3E, Dragon Magazine only)
Feats Index :: d20srd.org (3.5, SRD only)
Feats (4E only)
Character Feats for Dungeons & Dragons (D&D) Fifth Edition (5e) - D&D Beyond (5E only)
Monsters
Lists of Dungeons & Dragons monsters (all editions)
Echohawk's Complete D&D Monster Index (up to 4E, shout-out to @Echohawk)
AD&D Monster Database: Searchable - Dragonsfoot (1E and 2E only)
DragonDex - Index of Monsters (up through 3E, Dragon Magazine only)
Monster Index :: d20srd.org (3.5, SRD only)
Monsters for Dungeons & Dragons (D&D) Fifth Edition (5e) - D&D Beyond (5E only)
donjon; 5e Monster List (5E, non-adventure sources only)
https://5e.d20srd.org/indexes/monsters.htm (5E, SRD only)
Equipment
DragonDex - Weapons and Armor Index (up through 3E, mundane and magical, Dragon Magazine only)
Equipment & Special Materials Index :: d20srd.org (3.5, SRD only)
D&D Beyond (5E only)
Equipment :: 5e.d20srd.org (5E, SRD only)
Magic Items
DragonDex - Index of Magic Items (up through 3E, Dragon Magazine only)
Magic Items by Type and Source (BECMI only)
Encyclopedia Magica Series (2e) [BUNDLE] - Wizards of the Coast | AD&D 2nd Ed. | AD&D 2nd Ed. | Dungeon Masters Guild (2E only)
Magic Item Compendium (3.5) - Wizards of the Coast | Dungeons & Dragons 3.x | Dungeons & Dragons 3.x | Dungeon Masters Guild (3E only)
Magic Items Index :: d20srd.org (3.5, SRD only)
Update: D&D 4E Magic Item List (v1.03) - SnarkyBlog (4E only)
Magic Items for Dungeons & Dragons (D&D) Fifth Edition (5e) - D&D Beyond (5E only)
donjon; 5e Magic Items (5E, non-adventure sources only)
Magic Items Index :: 5e.d20srd.org (5E, SRD only)
Spells
DragonDex - Spells Index (up through 3E, Dragon Magazine only)
BECMI, Gazetteer and Rules Encyclopaedia Spells Index (BECMI only, conveniently cross-referenced with 5E)
Wizard's Spell Compendium Vol. 1 (2e) - Wizards of the Coast | Accessories | Dungeon Masters Guild (and subsequent volumes, 2E only)
Priest's Spell Compendium Vol 1 (2e) - Wizards of the Coast | Accessories | AD&D 2nd Ed. | Dungeon Masters Guild (and subsequent volumes, 2E only)
Spell Lists & Domains Index :: d20srd.org (3.5, SRD only)
Spell Compendium (3.5) - Wizards of the Coast | Dungeons & Dragons 3.x | Dungeons & Dragons 3.x | Dungeon Masters Guild (3E only)
Spells for Dungeons & Dragons (D&D) Fifth Edition (5e) - D&D Beyond (5E only)
donjon; 5e Spell Sheet (5E, non-adventure sources only)
Spell Lists & Domains Index :: 5e.d20srd.org (5E, SRD only)
Will update as I find more (or they're suggested below).
Multiple categories
Consolidated Lists (3E only, official)
D&D 5E - 5e Lists of Monsters, Spells, Races, Feats, Etc. (5E only (but very extensive), includes 3P, shout-out to @MechaTarrasque)
Races
List of character races in Dungeons & Dragons (originally from Wikipedia, all editions)
DragonDex - Index of Articles (up to 3E, Dragon Magazine only)
List of BECMI/RC Classes (BECMI only)
Race (4E only)
Character Races for Dungeons & Dragons (D&D) Fifth Edition (5e) - D&D Beyond (5E only)
Classes
Character class (all editions, core only)
DragonDex - Index of Articles (up to 3E, Dragon Magazine only)
List of BECMI/RC Classes (BECMI only)
Lists of Dungeons & Dragons classes (3E, 4E, 5E only)
List of alternative Dungeons & Dragons classes (originally from Wikipedia, includes character kits, all editions)
Classes Index :: d20srd.org (3.5, SRD only)
List of prestige classes (originally from Wikipedia, 3E only)
Subclass (4E only)
Character Classes for Dungeons & Dragons (D&D) Fifth Edition (5e) - D&D Beyond (5E only, includes unofficial Critical Role content)
Classes Index :: 5e.d20srd.org (5E, SRD only)
Themes
Character theme (4E only)
Backgrounds
Character Backgrounds for Dungeons & Dragons (D&D) Fifth Edition (5e) - D&D Beyond (5E only)
Skills
Compiled Proficiency List (2E only)
Skills Index :: d20srd.org (3.5, SRD only)
Skills Index :: 5e.d20srd.org (5E, SRD only)
Feats
DragonDex - Index of Feats and Flaws (3E, Dragon Magazine only)
Feats Index :: d20srd.org (3.5, SRD only)
Feats (4E only)
Character Feats for Dungeons & Dragons (D&D) Fifth Edition (5e) - D&D Beyond (5E only)
Monsters
Lists of Dungeons & Dragons monsters (all editions)
Echohawk's Complete D&D Monster Index (up to 4E, shout-out to @Echohawk)
AD&D Monster Database: Searchable - Dragonsfoot (1E and 2E only)
DragonDex - Index of Monsters (up through 3E, Dragon Magazine only)
Monster Index :: d20srd.org (3.5, SRD only)
Monsters for Dungeons & Dragons (D&D) Fifth Edition (5e) - D&D Beyond (5E only)
donjon; 5e Monster List (5E, non-adventure sources only)
https://5e.d20srd.org/indexes/monsters.htm (5E, SRD only)
Equipment
DragonDex - Weapons and Armor Index (up through 3E, mundane and magical, Dragon Magazine only)
Equipment & Special Materials Index :: d20srd.org (3.5, SRD only)
D&D Beyond (5E only)
Equipment :: 5e.d20srd.org (5E, SRD only)
Magic Items
DragonDex - Index of Magic Items (up through 3E, Dragon Magazine only)
Magic Items by Type and Source (BECMI only)
Encyclopedia Magica Series (2e) [BUNDLE] - Wizards of the Coast | AD&D 2nd Ed. | AD&D 2nd Ed. | Dungeon Masters Guild (2E only)
Magic Item Compendium (3.5) - Wizards of the Coast | Dungeons & Dragons 3.x | Dungeons & Dragons 3.x | Dungeon Masters Guild (3E only)
Magic Items Index :: d20srd.org (3.5, SRD only)
Update: D&D 4E Magic Item List (v1.03) - SnarkyBlog (4E only)
Magic Items for Dungeons & Dragons (D&D) Fifth Edition (5e) - D&D Beyond (5E only)
donjon; 5e Magic Items (5E, non-adventure sources only)
Magic Items Index :: 5e.d20srd.org (5E, SRD only)
Spells
DragonDex - Spells Index (up through 3E, Dragon Magazine only)
BECMI, Gazetteer and Rules Encyclopaedia Spells Index (BECMI only, conveniently cross-referenced with 5E)
Wizard's Spell Compendium Vol. 1 (2e) - Wizards of the Coast | Accessories | Dungeon Masters Guild (and subsequent volumes, 2E only)
Priest's Spell Compendium Vol 1 (2e) - Wizards of the Coast | Accessories | AD&D 2nd Ed. | Dungeon Masters Guild (and subsequent volumes, 2E only)
Spell Lists & Domains Index :: d20srd.org (3.5, SRD only)
Spell Compendium (3.5) - Wizards of the Coast | Dungeons & Dragons 3.x | Dungeons & Dragons 3.x | Dungeon Masters Guild (3E only)
Spells for Dungeons & Dragons (D&D) Fifth Edition (5e) - D&D Beyond (5E only)
donjon; 5e Spell Sheet (5E, non-adventure sources only)
Spell Lists & Domains Index :: 5e.d20srd.org (5E, SRD only)
Will update as I find more (or they're suggested below).
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