Custom Simple Spawner:

admincheat GiveItem "Blueprint'/Game/Mods/SimpleSpawners/SS_Customs_BP.SS_Customs_BP'" 1 1 0

Spawns ANY creatures you want, even modded creatures.
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Base Simple Spawner:

admincheat GiveItem "Blueprint'/Game/Mods/SimpleSpawners/SS_Base_BP.SS_Base_BP'" 1 1 0

Spawns all base game creatures. NOT including: alphas, bosses, marine, or event creatures.
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Scorched Earth Simple Spawner:

admincheat GiveItem "Blueprint'/Game/Mods/SimpleSpawners/SS_SE_BP.SS_SE_BP'" 1 1 0

Spawns all Scorched Earth specific creatures except wyverns.
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Aberration Simple Spawner:

admincheat GiveItem "Blueprint'/Game/Mods/SimpleSpawners/SS_Aberration_BP.SS_Aberration_BP'" 1 1 0

Spawns all non-marine Aberration creatures.
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Special Simple Spawner:

admincheat GiveItem "Blueprint'/Game/Mods/SimpleSpawners/SS_Special_BP.SS_Special_BP'" 1 1 0

Spawns alpha creatures, bosses, zombie creatures, and misc. other creatures. (Some event creatures cannot be spawned unless its event is currently active)
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Marine Simple Spawner:

admincheat GiveItem "Blueprint'/Game/Mods/SimpleSpawners/SS_Water_BP.SS_Water_BP'" 1 1 0

Spawns all non-amphibious marine creatures including alphas and Aberration marine creatures.
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Wyvern Simple Spawner:

admincheat GiveItem "Blueprint'/Game/Mods/SimpleSpawners/SS_Wyverns_BP.SS_Wyverns_BP'" 1 1 0

Spawns all varieties of wyverns.
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Simple Spawner Nest:

admincheat GiveItem "Blueprint'/Game/Mods/SimpleSpawners/SS_Nest_BP.SS_Nest_BP'" 1 1 0

Spawns the eggs of nearby dinos.
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Simple Spawner Marine Nest:

admincheat GiveItem "Blueprint'/Game/Mods/SimpleSpawners/SS_WaterNest_BP.SS_WaterNest_BP'" 1 1 0

Spawns the eggs of nearby marine dinos.