APITemplate.io - APITemplate.io allows you to auto-generate social images and PDF documents with a simple API or automation tools like Zapier & Airtable. No CSS/HTML required.
Unsplash - Unsplash is a website with high-quality free HD images. It has a catalog of more than three hundred thousand striking images that are neatly organized with tags. Read more about Unsplash.
Bannerbear - Auto-generate IG Stories, Pinterest Pins and more
Pexels - Find the best free stock images about Browser Home Page. Download all photos and use them even for commercial projects.
PIXELIXE Studio - Pixelixe makes it easy to create and edit any type of online graphics. For social media, blogs, ads, and more!
Good Free Photos - Large free stock photo site with thousands of public photos