Keep in mind that some of these types of spawners do need to be in a specific area, some might need dark areas to spawn, some might need grass areas to spawn.
/spawner will give you a list of all of the things, for example:

Rabbit:
doesn't work.
Endermite:
doesn't work.
FurnaceMinecart:
doesn't work.
Ocelot:
works.
Magmacube:
works.
Horse:
doesn't work.
Guardian:
doesn't work.
Cow:
works.
Enderman:
works.
HopperMinecart:
doesn't work.
Minecart:
doesn't work.
Villager:
works.
Skeleton:
works.
Blaze:
doesn't work, but there are still spawners out there that are blaze, because it used to be enabled.
SpawnerMinecart:
doesn't work.
EnderDragon:
doesn't work.
Chicken:
works.
ExperienceOrb:
doesn't work.
ChestMinecart:
doesn't work.
Slime:
works, but you have to be in a slime chunk.
Wither:
doesn't work.
Zombie:
you're allowed to set zombie spawners, but they do not spawn, so these do not work.
Witch:
doesn't work, but there are still spawners out there that are witch, because it used to be enabled.
CaveSpider:
works.
Spider:
works.
Sheep:
works.
IronGolem:
doesn't work.
TNTMinecart:
doesn't work.
ArmorStand:
doesn't work.
MushroomCow:
works.
EnderCrystal:
doesn't work.
Creeper:
works.
Boat:
doesn't work.
Squid:
works, but you have to be at a specific level in order for them to spawn.
Pig:
works.
Ghast:
doesn't work.
Wolf:
works.
Bat:
doesn't work
Snowman:
works.
Silverfish:
do not work, but there might be some spawners out there that do spawn silverfish, it used to be enabled.
Giant:
doesn't work.


Enjoy! ​

 

Nice job.

For people who are interested in changing their spawner(s), they can look at this and get ideas what you can and can't spawn.
#FirstCommentXD

 

Does anyone know who still has Blaze Spawners?

 

One guy called like Magic used to have them last year

 

Can donor 10's do /spawner too?

 

Very nice, very helpful >w<

 

What about Charged Creepers? You actually can use them in a spawner, but do you know about them being possible to use?

 

Also Squid spawn at about Y 50 to Y 60

 

It just has to be below y=70.

Also, Silverfish do Spawn

 

They do not work.

Donor 25 and up can change spawners.