Right before the update where many effects were re-categorized into the Major and Minor buffs and debuffs (and wherein no minor can stack with a minor nor a major with a major) I had compiled a list of all "effects and bonuses" available in-game from the following sources:

Armor set bonuses
Skills, active and passive
Potions
Traits
Enchantments

It was organized by effect so one could theorycraft. This new list will have 2 types of entries: What conditions cause the effect to happen (designated as "proc"), and what effect happens.

This list will be updated as I work on it but I'm posting it as a work in progress to get feedback from other players to improve the listings and get ideas I might not have thought of!

Here's the compiled list from armor sets I made thus far tonight. This will help to consolidate the categories as well as odd outliers that are unlike the others so that I can then add the Set bonuses, skills, passives, etc. to each entry on the list.

1. Ability cost increase
2. Ability use that costs magicka proc
3. Alchemical poison procs
4. All costs reduction
5. AoE spell damage reduction
6. Armor Ability slotted
7. Armor Ability use proc
8. Assault ability cast proc
9. Attacks from behind damage bonus
10. Bash attack gains shock damage bonus
11. Blade of Woe use procs
12. Bleed status cause physical damage DoT
13. Blind attacker 100% miss chance
14. Block attack proc
15. Block attack with no duration proc
16. Block mitigation bonus
17. Blocking procs
18. Blocking projectile spells proc
19. Bow abilities against other players bonus
20. Bow ability cost reduction
21. Bow ability damage bonus
22. Bow ability range increase
23. Bow attacks proc
24. Break free cost reduction
25. Break free cost reduction
26. Break free immunity duration bonus
27. Burning status effect caused
28. Burning status effect proc
29. Cause damage proc
30. Channeling or casting a spell proc
31. Charge ability causing damage procs
32. Class ability cast procs
33. Constitution passive bonus
34. Critical attack % bonus
35. Critical attack proc
36. Critical damage bonus
37. Critical damage dealt procs
38. Critical damage reduction bonus
39. Critical damage reduction for ally
40. Critical damage taken procs
41. Critical heal proc
42. Critical hits restore own health
43. Crouch cost reduction
44. Daedric damage bomb triggered by other player's heavy attack
45. Damage from other players' AoEs reduction
46. Damage from other players reduction
47. Damage Shield
48. Damage shield on ally procs
49. Damage shield to nearby allies
50. Damage taken reduction
51. Damage to self proc
52. Damaged by spell proc
53. Death of nearby enemy procs
54. Destruction staff equipped proc
55. Detonate AoE targeted on enemy
56. Disease damage added
57. Disease damage orbs frontal projectiles
58. Dodge bonus
59. Dodge next attack
60. Dodging attack proc
61. DoT on enemy procs
62. Dying will proc
63. Elemental damage taken procs
64. elemental resistance bonus
65. Elemental resistance type rotates round robit while in combat and own attacks of that element damage bonus
66. enchantment cooldown reduction
67. enchantment potency bonus
68. Enemy below [x] % health damage bonus
69. Enemy physical resistance debuff
70. Enemy weapon damage debuff
71. Execute ability causing damage procs
72. Fire damage added
73. Flame AoE centered on enemy target
74. Flame AoE centered on self
75. Flame AoE centered on target
76. Flame damage dealt bonus
77. Flame damage dealt proc
78. Flame DoT duration bonus
79. Frost damage AoE centered on enemy
80. Frost damage dealt proc
81. Frost damage dealt procs
82. Group bonuses
83. Heal a nearby ally
84. Heal ally proc
85. Heal self for damage done
86. Heal self while at full health proc
87. Healing ally at 100% health proc
88. Healing ally with HoT procs
89. Healing AoE area proc
90. Healing AoE centered on target ally
91. Healing critical on ally proc
92. Healing done bonus
93. Healing enemy receives debuff
94. Healing received at full health procs
95. healing taken bonus
96. Healing taken increased for nearby group members
97. Health below % proc
98. Health bonus for up to 12 group members
99. Health recovery bonus
100. Health restore on bow attack non-DoTs
101. Health-stealing beam
102. Heavy attack fully charged damage bonus
103. Heavy attack fully charged proc
104. Hidden and not moving proc
105. Immobilize AoE
106. Immobilize enemy
107. Imperial City locale proc
108. Intercept projectiles for allies
109. Interrupting enemy proc
110. Irresistibe damage against enemies with a damage shield
111. Killing enemy proc
112. Knock Down
113. Knock Down AoE
114. Light attack and then fully charged heavy attack proc
115. Light attacks gain lightning damage bonus
116. Light attacks restore [x] health
117. Light attacks twice consecutively procs
118. Light or heavy attack damage bonus
119. Light or heavy attack proc
120. Lightning AoE centered on self
121. Magic damage AoE centered on self
122. Magicka AoE centered on ally
123. Magicka below [X] % proc
124. Magicka cost for up to 12 group members reduction
125. Magicka cost of abilities reduction
126. Magicka recovered when taking damage
127. Magicka recovered when taking melee damage
128. Magicka recovery bonus
129. melee % chance proc
130. Melee attack bonus fire damage
131. melee damage add fire damage
132. Melee damage dealt proc
133. Minor Main AoE cenered on self
134. Mounted movement speed bonus
135. Movement speed bonus
136. Mundus stone bonus
137. Mundus stone use two boons at the same time
138. Negative effect duration reduction
139. Negative effect removal
140. Next attack damage bonus
141. Not taking damage for [x] duration procs
142. Pets active proc
143. Pets attacking enemy you've recently attacked restores health and stamina
144. Physical and Spell Resistance for allies bonus
145. Physical and Spell resistance increased based on own missing Health
146. Physical damage AoE centered on self
147. Physical Resistance/Armor bonus
148. Players' damage taken reduction
149. Poison AoE centered on enemy target
150. Poison AoE centered on self
151. Poison damage added
152. Poison damage bonus
153. Poison damage to melee attackers
154. Poison damage to target bonus
155. Poisoned status effect of enemy proc
156. Potion drink proc
157. Range of abilities increase
158. Recovery all attributes in combat bonus
159. Reflect damage back on enemy
160. Reflect projectile back at caster
161. Ressurect an ally proc
162. Restoration staff ability magicka cost reduction
163. Resurrection of ally time reduction
164. Roll dodge duration bonus
165. Roll dodge proc
166. Roll dodge procs
167. Roll dodge through enemies procs
168. Rune left behind detonates on enemies for poison damage and immobilizes
169. Siege weapon damage reduction
170. Snare duration reduction
171. Snare target
172. Snare, Stun and Disorient effect duration reduction
173. Sneaking movement speed
174. Sneaking movement speed penalty ignored
175. Sneaking or invisible procs
176. Sneaking target damage bonus
177. Soul gem filled
178. Soul Trap ability damage bonus
179. Spell damage bonus
180. Spell Resistance bonus
181. Spell resistance to allies bonus
182. Spring cost reduction
183. Stackable bonuses
184. Stamina ability cast proc
185. Stamina ability cost reduction
186. Stamina recovery bonus
187. Stamina recovery bonus for up to 12 group members
188. Stamina restore on bow attack non-DoTs
189. Stealth attack bonus
190. Stealth detection radius increase
191. Stealth range you can be detected reduction
192. Stun
193. Stun AoE
194. Stunned and off-balance enemy damage bonus
195. Stunned, Immobilized, Feared, Knocked Down or Disoriented proc
196. Summon animated weapon to attack your enemies
197. Summon dwemer automaton restores either health, stamina or magicka at random
198. Summon fire-breathing daedroth, basic attacks do physical damage
199. Support ability cast proc
200. Synergy of your own that another activates procs
201. Synergy you activate procs
202. Taking melee damage proc
203. Taunt applied to enemy
204. Taunt enemy under [x] % health proc
205. Taunting procs
206. Tel Var stone multiplier proc
207. Two-handed weapon attack proc
208. Ultimate activation procs
209. Ultimate cost reduction
210. Ultimate gain bonus
211. Weapon and Spell damage for allies bonus
212. Weapon Damage and Spell Damage both become the highest of the two values
213. Weapon damage bonus
214. Werewolf transformation cost reduction