The best alternatives to Bacon Mockup are Placemat, Place Dog, and Fill Murray. If these 3 options don't work for you, we've listed a few more alternatives below.
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If you want a cute placeholder of a sweet little kitty, then Place Kitten is the tool you are looking for. It is easy-peasy to use, you just need to write the size you need after the Placekitten URL and you get it. In case you want a specific picture of theirs, you can request it with the image number and the size you want it. Done!