List of free social-image stuff for developerππ½
If you're looking for all programming tools around social-image (not just free). Check this page List of social-image Programming Tools

Free 50 renders a month
OG impact
Create stunning, free social images for your brand. Choose a template and generate as many images as you need, whether it's 1, 10 or 1,000!
Tag: blogging, social-image
Free with attribution and ready use template