RANDOM.ORG - RANDOM.ORG offers true random numbers to anyone on the Internet.
placeholder.pics - Lightest way to include placeholder images in your design
Wheel Decide - Wheel Decide is a free to use web-based spinner platform that allows the people create their own digital wheels system for prize giveaways, decision making, games and much more.
PlaceKitten - Dead-easy placeholder images. Of kittens.
Wheel of Names - Free and easy to use spinner. Used by teachers and for raffles. Enter names, spin wheel to pick a random winner. Customize look and feel, save and share wheels.
Fill Murray - Custom-sized placeholder images of Bill Murray