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.
Shareaholic - Shareaholic is trusted by over 300000 brands, businesses, agencies, and individuals to grow website traffic and engagement 24 hours a day, 7 days a week.
Landscape by Sprout Social - An interactive tool for social media image resizing
AddThis - AddThis free website tools include share buttons, targeting tools and content recommendations help you get more likes, shares and followers and keep them coming back.