Resources

Testing and Debugging

• 5 Ways to Debug WordPress
• Debug Bar plugin
• Log Deprecated Notices plugin
• Theme Check plugin

Theme Development

• i18n for WordPress Developers (Codex)
• RTL Language Support (Codex)
• Theme Development (Codex)
• Theme Unit Test (Codex)
• WordPress Code Standards (Codex)
• WordPress CSS Code Standards

WordPress.com Themes

• Theme Launch Announcements
• Theme Showcase

WordPress.org Themes

• Automattic Themes