PH
1. cobalt.tools — Download any social media video
2. photopea.com — Free Photoshop
3. temp-mail.org — Temporary email with one click
4. tinywow.com — Over 100 free tools in one site
5. archive.org — Access any old webpage
6. libgen.li — Millions of free textbooks
7. sci-hub.al — Free research articles
8. alternativeto.net — Find free alternatives to apps
9. justwatch.com — Locate where to stream any content
10. gutenberg.org — 70,000 free classic books
11. pdfdrive.com — Free PDF downloads
12. openculture.com — Free courses from elite universities
13. wolframalpha.com — Solve any math problem instantly
14. remove.bg — Remove background with one click
15. cleanup.pictures — Erase objects from photos
16. unscreen.com — Remove video background for free
17. squoosh.app — Compress any image for free
18. excalidraw.com — Free hand-drawn graphics
19. carbon.now.sh — Turn code into artwork
20. ray.so — Stunning code screenshots
21. flightradar24.com — Track any flight in real time
22. camelcamelcamel.com — Track Amazon price history
23. haveibeenpwned.com — Check if you've been häçked
24. virustotal.com — Scan malware in any file
25. privnote.com — Send self-destructing messages
26. file.io — Share files that auto-delete
27. archive.ph — Archive any webpage forever
28. accountkiller.com — Erase your presence from any website
29. radio.garden — Listen to any radio station worldwide
30. tunefind.com — Identify songs from any show
31. musicforprogramming.net — Music for focus
32. mynoise.net — Custom soundscapes for concentration
33. annasarchive.org — Search every book ever written
34. elicit.com — AI assistant for research articles
35. consensus.app — Search scientific consensus
36. connectedpapers.com — Visually map research
37. semanticscholar.org — Free academic search
38. scispace.com — Understand any research article
39. summarize.tech — Summarize any YouTube video
40. phind.com — AI search for developers
41. regex101.com — Test any regular E×ρréššion instantly
42. codebeautify.org — Format any code clearly
43. explainshell.com — Understand terminal commands
44. tldraw.com — Infinite canvas in your browser
45. downdetector.com — Check if a website is down
46. tineye.com — Reverse image search
47. fast.com — Test your internet speed
48. smallpdf.com — Edit PDFs for free
49. ilovepdf.com — Merge and split PDFs
50. 10minutemail.com — Temporary email in seconds
All legal. All free. 
Save it before you forget.