Pablo by Buffer is a free, online image creation and social media sharing tool designed to help businesses, bloggers, and individuals create beautiful and engaging visuals for their social media accounts in just a few clicks. With Pablo, users can create stunning images, incorporating their own photos, text, and effects, to draw attention to their content. Pablo provides users with a wide range of image editing tools such as filters, cropping, and resizing, as well as a library of over 600,000 licensed stock photos and illustrations. Additionally, Pablo allows users to easily share their creations across all major social media platforms, including Facebook, Twitter, LinkedIn, and Pinterest.
PixTeller is a pretty good HTML5 editor. We use it every day for our social publishing.