A list of awesome and useful websites that should be in your bookmarks. 👾🤖

• Contents
  • Testing
    • Accessibility Testing
    • Performance Testing
    • Cross Browser Testing
    • Testing Checklists
    • Other Testing Tools
  • Graphics
    • Photography Stocks
    • Photography Tools
    • Illustration, Design Inspiration Stocks
• Contribution

• Tenon.io
• Web Accessibility
• Accessibility Insights

• GTmetrix
• Nibbler
• WebPageTest
• Pingdom Tools
• webhint
• SpeedCurve
• Dotcom-Tools
• PageSpeed Insights

• turbo.net
• BrowserLing
• BrowserStack

• SEO Checklist
• Security Checklist
• Checklist Design
• Web Developer Checklist
• The Front-End Checklist
• The HTML & CSS Security Checklist

• SEO Testing
• web.dev | Testing Tools
• RegExr | Regex Testing, Learning
• W3C | Markup Validation Testing
• Regex101 | Regex Testing, Debugging
• Troy | Responsive Device Testing
• Progressive Tooling | Testing Tools
• Mobile Friendly Testing
• Mozilla Observatory | Security Testing

• Pixabay
• Pexels
• PicJumbo
• Unsplash
• StockSnap
• Albumarium
• SplitShire
• NegativeSpace
• Foodiesfeed
• Gratisography
• Burst Shopify
• Let's Enhance
• Life of Pix

• Imgur | Photo Sharing Platform
• Unsplash | Photo Placeholder
• LoremPixel | Photo Placeholder
• Photopea | Online Photoshop

• Logopond | Logo Stock
• CollectUI | Design Stock
• unDraw | Illustration Stock
• ManyPixels | Illustration Stock
• Designspiration | Design Stock
• TypoGraphicPoster | Poster Stock

Your contributions and suggestions are heartily♡ welcome, though. (✿◠‿◠)