Polarr 2.0a - An online photo editor (big data meets Lightroom)
APITemplate.io - APITemplate.io allows you to auto-generate social images and PDF documents with a simple API or automation tools like Zapier & Airtable. No CSS/HTML required.
SocialSizes - Sketch templates for sharing images & videos on social media
Bannerbear - Auto-generate IG Stories, Pinterest Pins and more
Social Templates Bundle for Instagram - Large bundle of 240 posts & stories templates for Instagram
PIXELIXE Studio - Pixelixe makes it easy to create and edit any type of online graphics. For social media, blogs, ads, and more!