Situs web yang bermanfaat

Please note, all of these tools and services are free as in "freeware".

Learn PHP, HTML, CSS, and more:
- https://w3schools.com
  (not to be mistaken with W3C, not related at all)
- https://codecademy.com
- https://code.org
- https://websitesetup.org/php-cheat-sheet/
Install Apache, PHP, Perl, MySQL, etc locally on your own machine:
- https://apachefriends.org
Web browser tools:
- Firefox:
  - https://developer.mozilla.org/en-US/docs/Tools
- Chrome:
  - https://developers.google.com/chrome-developer-tools/
- Vavaldi:
  - https://vivaldi.com
- Brave:
  - https://brave.com
- Safari:
  - https://developer.apple.com/library/mac/documentation/AppleApplications/Conceptual/Safari_Developer_Guide
- Internet Explorer:
  - https://msdn.microsoft.com/en-us/library/bg182326(v=vs.85).aspx
Editors & IDEs:
- https://notepad-plus-plus.org (recommended)
- https://geany.org
- https://brackets.io
- https://netbeans.org
WYSIWYG:
- https://seamonkey-project.org
- https://google.com/webdesigner
Analysers:
- https://gtmetrix.com
- https://jshint.com
Validators:
- https://validator.w3.org (Markup)
- https://jigsaw.w3.org/css-validator (CSS)
Miscellaneous: