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.
Stylebot - Change the appearance of websites instantly. Preview and install styles created by other users on stylebot.me
LERA by AdvancedBytez - An intelligent accessibility reporting experience. Automate accessibility reports for automated testing results.
FreeStylerWs - Styles and skins for all popular sites in the web
Adobe Spark Post - Adobe Spark Post is the fun and fast way to create stunning graphics for all occasions.
Amino Editor - Amino is a Chrome browser extension for customizing web page presentation with user CSS.