If you mean for factors then...
AT
ATX
BTX
EATX
mATX
iTX
If you mean manufacturers...
Asus
MSI
EVGA
XFX
Gigabyte
BIOSTAR
ASROCK
ECS
AT
ATX
BTX
EATX
mATX
iTX
If you mean manufacturers...
Asus
MSI
EVGA
XFX
Gigabyte
BIOSTAR
ASROCK
ECS