Video Games. Not sure if I could get 100 different franchises, but definitely different games.

What the hell, I'll try both. I'll name video games from different franchises until I can't think of any more:

1. Super Mario Bros
2. The Legend of Zelda
3. Kirby's Adventure
4. Pokemon Red
5. Excitebike
6. Metal Gear Solid
7. Fire Emblem Awakening
8. Xenoblade Chronicles
9. Blinx the Time Sweeper
10. Drawn to Life
11. Scribblenauts
12. Donkey Kong Country
13. Banjo-Kazooie
14. Halo
15. Team Fortress 2
16. Portal
17. Spiral Knights
18. Punch Out!!
19. Mega Man
20. Sonic the Hedgehog
21. Pac-Man
22. Metroid
23. Kid Icarus: Uprising
24. Gyromite
25. Ice Climbers (Remembering the Smash Bros roster is still using memory alone)
26. Pikmin
27. F-Zero
28. Star Fox
29. Eathbound
30. Cave Story
31. VVVVVV
32. Fez
33. Super Meat Boy
34. The Binding of Isaac
35. Shovel Knight
36. Rayman
37. Klonoa
38. Fusion Frenzy
39. Wii Fit
40. Tomodachi Life
41. Duck Hunt
42. Super Smash Bros (since I'm recalling it for reference... might as well)
43. Animal Crossing (and there ends the Smash bros roster. Now I'm on my own...)
44. Fallout 3
45. Skyrim
46. Battlefield
47. (ugh) Call of Duty
48. Payday 2
49. Minecraft
50. Terraria
51. Prince of Persia
52. Need for Speed
53. Bioshock Infinite
54. God of War
55. Dynasty Warriors
56. Ninja Gaiden
57. Conker's Bad Fur Day
58. Time Splitters
59. Super Hexagon
60. Battleblock Theater
61. Castle Crashers
62. Street Fighter
63. Mortal Kombat
64. Half-Life
65. Final Fantasy
66. Golden Sun
67. Chibi-Robo
68. Harvest Moon
69. The Sims
70. Five Nights at Freddy's
71. Slender
72. Bit Trip Runner
73. Thomas was Alone
74. Star Wars: Knights of the old Republic
75. Mass Effect
76. Dead Space
77. Resident Evil
78. Grand Theft Auto
79. World of Warcraft
80. Starcraft
81. League of Legends
82. Smite
83. Dota 2
84. Sportsball
85. Little Inferno
86. World of Goo
87. Okami
88. Phoenix Wright: Ace Attorney
89. Professor Layton and the curious Village
90. Tetris (THE HOME STRETCH APPROACHES)
91. Chrono Trigger
92. Contra
93. Doom
94. Borderlands
95. Duke Nukem
96. Batman: Arkham City
97. Hearthstone
98. Runescape
99. Hatoful Boyfriend
100. Bayonetta

BOOM, 100 different franchises, all from memory! I didn't actually think I could pull that off.

^{god I have no life}