Free Tools for Evaluating Web Sites

WCAG Focused Browser Plugins

• Deque's aXe tool
• WAVE Toolbar

Browser Tools

These tools will also enhance your development skills and are used in conjunction with aXe and WAVE:

• Firefox Developer
• Chrome Accessibility Developer

Contrast Checkers & Visual Emulators

• Paciello Group Contrast Analyzer
• No Coffee - vision emulator

Key Board Testing

Finally, WebAIM has a very good tutorial on keyboard testing.