Nibbler - Free tool for testing how good your website is, and what you can do to improve it. Check accessibility, SEO, social media, compliance and more.
Contraste - Check the accessibility of text against the WCAG.
LERA by AdvancedBytez - An intelligent accessibility reporting experience. Automate accessibility reports for automated testing results.
RoRvsWild theme - Colors for developers with sensitive eyes
Adobe Spark Post - Adobe Spark Post is the fun and fast way to create stunning graphics for all occasions.
Stark - Contrast check and color blindness simulator for Sketch.