Placid - Use Placid to auto-generate images, videos & PDFs from reusable templates
Bannerbear - Auto-generate IG Stories, Pinterest Pins and more
OG IMPACT - A free, open source API for generating social media images
OgHero - Generate social share images for your blogs automagically
OGimage.gallery - Carefully collected OG images gallery
Social Image Generator - Automatically Generate Social Images For Your WordPress Site