14/05/2023
30 popular apps and websites and the frameworks or languages they use:
1. Facebook - React, PHP
2. Instagram - Python, Django
3. Twitter - Ruby on Rails, Scala
4. LinkedIn - AngularJS, Java, Play Framework
5. TikTok - Java, Kotlin, Swift, Python
6. Netflix - Java, Spring Boot, React
7. Amazon - Java, Node.js, React
8. YouTube - JavaScript, Python
9. WhatsApp - Erlang, Java
10. Google - Java, Python, Angular
11. Uber - Node.js, Python, React Native
12. Airbnb - React, Ruby on Rails, JavaScript
13. Slack - JavaScript, Node.js, React
14. Dropbox - Python, Go, JavaScript
15. Trello - Ruby on Rails, Backbone.js
16. Asana - TypeScript, React, Node.js
17. GitHub - Ruby on Rails, React
18. Medium - JavaScript, Node.js, React
19. Pinterest - React, Python, Django
20. Reddit - Python, Flask
21. Spotify - Java, JavaScript
22. Snapchat - Java, Objective-C, Swift
23. Yelp - PHP, MySQL
24. Coursera - Python, Django, React
25. Zoom - Java, React, TypeScript
26. Shopify - Ruby on Rails, React
27. Stripe - Python, Java, Ruby
28. Evernote - Java, Kotlin, React Native
29. Microsoft Teams - TypeScript, React, Node.js
30. Salesforce - Apex, JavaScript, React
Note that the technology stack used by these apps and websites may change over time as new features and functionalities are added, and as the development team's needs and preferences evolve.