Placemat - Pretty nice placeholder images.
LINER - LINER AI Copilot is currently powered by ChatGPT/GPT-4, Google Search Engine, and information from high-quality highlights of an enormous number of users from all around the world.
PlaceKitten - Dead-easy placeholder images. Of kittens.
Highlight - "Highlight" physical books through conductive pages 📖✨
placeholder.pics - Lightest way to include placeholder images in your design
LiquidText Ink - A fast, ink based way to review and analyze documents