I was curious, so I ran through my collection. I was mainly surprised by the sheer number of manufacturers. 109 manufacturers for over 500 games!

Each "*" represents one game. Data is taken from the DP online database using the listed manufacturer. What strikes me as odd, though, is that some of these names are ones that I had only known as developers. Is this just new to me, or were some of the games in my collection self-published by companies that normally are better known as developers?

20th Cent Fox. *
3DO................. *
989 Studios.... **
Acclaim........... **********
Activision........ ******************
Agetec............. ***********
Agetec/A1....... *
Arena............... *
ASC Games..... *
ASCII.............. ****
Atari................. *****************************************
Athena............. *
Atlus................ *****
Ballistic........... *
bam!................ ****
Bandai.............. *
Berkeley Sys... *
Camerica......... **
Capcom........... ***************************************
CBS Games..... **
Coleco............. **
Crave............... *****
Crystal Dynam ***
Disney.............. *
Dreamworks..... *
DSI................... **
EA Victor......... *
Eidos................ ***********
Electronic Arts **************
Empire.............. **
Enix................... ***
Epic................... *
ESP................... **
FCI.................... *
Fox Interact...... **
Gotham Games. **
GT Interactive.. *********
Hamster............. ***
Hasbro Interact *****
Hot-B................. *
Hudson.............. *
Imagic............... *
Infogrames........ *******
Interplay........... *****
Jaleco................ **
Kemco............... *
Konami.............. ************************************
LJN.................... *
LucasArts......... *****
M Network......... *
Majesco............ *****
Mean Hamster.. *
Metro3D............ *
Microsoft........... **
Midway.............. *************
Milton Bradley.. *
Mindscape........ ***
Mud Duck......... ***
Namco.............. *********************
Natsume........... **
NewKidCo......... *
Nintendo........... *****************
NTVIC.............. *
Origin................ *
Parker Bros...... **
Playmates........ *
Psikyo.............. **
Psygnosis........ *********
Rare.................. *
Renovation....... **
Rockstar........... ***
Romstar............ *
Sammy............. **
Sears................ ****
Sega................. ************************************************
Seismic............ **
Sierra............... **
SNK.................. *
Sony................. ********************
Sony/Agetec.... *
Spectrum Holo. *
Squaresoft........ *******
SSI................... *
SunSoft............. *
SVG Dist.......... *
T*HQ............... ******
Taito................. **
Takara.............. *
Take2 Interact *******
Taxan............... *
Technosoft....... *
Tecmo.............. *
Tengen............. *
Time Warner.... *
Titus................. **
Toho.................. *
Tommo.............. ****
Treasure........... *
Treco................ **
Ubi Soft............. ****
Universal........... *
Viacom.............. *
Vic Tokai........... *
Virgin................. *
Williams............. ***
Working Designs ******
Xicat................... *
Xing Entertain.... **
XS Games........... ****