Automatic1111 has automation by default.

 At the bottom of the text 2 image tab is a section called script.  This is a dropdown with these options:

• None.
• Prompt matrix.
• Prompts from file or text box.
• X/Y/Z Plot.
• One Button Prompt.
• Controlnet m2m.

None is the default. It turns this section off.

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Prompt matrix.  You can create a list of options inside a set of angle brackets separated with pipe symbols and get an image for each option.  

A male (<dwarf | elf | human>) warrior.

Would generate 3 images.

A (< male | female>)  (<dwarf | elf | human>) warrior

would generate 6 images. 

A (< male | female>)  (<dwarf | elf | human>) (<warrior | cleric | thief | wizard>) 

would generate 24 images.

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Prompts from file or text box lets you feed in a list of newline separated prompts which each get ran.

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X/Y/Z plot lets you pick three options and lets you vary these with each execution, then gives you a nicely formatted and labelled set of images that will let you learn what varying these options do.  And the best result is already generated for you in the output file.  

You can give a range for it, 5-7 which would give 5, 6, 7 on an axis. you can say 5-6 (+.25) to go from 5 to 6 in quarter steps, or give 2-10 [2] to go in steps of 2.  

The models and diffusers are added to a list with mouse clicks. Just put the ones you want to compare in the plot in your list.

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One button prompt generates an image at random. Kind of a dealer's choice.

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Not sure what the last option does yet.