Placid - Use Placid to auto-generate images, videos & PDFs from reusable templates
Sharingbuttons.io - Quickly generate social sharing buttons with a tiny performance footprint.
Imagify - Optimize and resize images online and through your CMS.
Simple Sharing Buttons Generator - Share to Facebook, Twitter, Google+, and other social networks using simple HTML buttons
Landscape by Sprout Social - An interactive tool for social media image resizing
Social Share Kit - Library of CSS/JavaScript social sharing tools