List of CRT manufacturers:

CRT means Cathode Ray Tube. Almost all manufacturers mentioned below have stopped producing CRTs, since now everyone buys and seems to love LCDs (with exceptions, obviously) The list:

1. rca
2. ergon (sold to thompson, resulting in videocolor)
3. videocolor (bought by videocon)
4. videocon
5. philips (merged with lg philips)
6. lg (merged with lg phillips)
7. lg philips displays
8. Orion electric/electronics (spun off into orion display)
9. magnavox
10. toshiba (merged with mtpd)
11. mullard (british arm of philips)
12. general electric
13. Panasonic (merged with mtpd)
14. Matsushita Toshiba Picture Display (mtpd)
15. lp displays (lg philips with new lg? ownership (philips backed off lg philips lcd, and the management was replaced with guys with korean-sounding names)
16. chungwha picture tubes (went bankrupt in 2019 because of the US-China trade war and overreliance on the chinese electronics market, began to make LCDs circa 1997, and AMOLEDs circa 2012, stopped CRT production in 2008-2012? )
17. Chinese (Hua Shi, 14sx8y4, 14sx5y4, here , too, here, here, here)
18. dongguan crt manufactory
19. sony
20. hitachi
21. mitsubishi
22. Thomson (crt division sold to videocon)
23. Sharp
24. Sylvania
25. Samsung electronics (later samsung SDI)
26. Itt germany (later panasonic)
27. Hitachi
28. Thai crt co. ltd. (joint venture between siam cement and mitsubishi electric)
29. irico
30. goldstar (changed its name to lg)
31. Sanyo
32. Zenith
33. ferranti
34. lexel imaging systems (purchased by thomas electronics)
35. Planigon (Nokia?)
36. tektronix
37. tct (czech)  tesla, TVC roznov
38. valvo (valvo euro color)
39. JCT CPT JCTEL india
40. samtel india
41. shanghai novel cpt
42. hua fei color display systems
43. cai hong
44. national electronics
45. ekranas

Current:

Toshiba hokuto (not anymore)

Thomas electronics

Most stopped production in the 2000s (sony in 2008, mtpd in 2006) lp displays (aka lg) seems to have stopped production shortly after the release of their retro crt tv in the early 2010s. samsung stopped production in 2012, and videocon stopped in 2015.

I'd like to thank Frank Sharp for shedding light on CRTs through his blog http://obsoletetellyemuseum.blogspot.com/.

More information about CRTs can be found below:

CRT designation systems

all of the above links are also on the internet archive's wayback machine, and some are also available on archive.today, so you can go there if the links are down or broken. (it is normal for archive.today to redirect you to one of their subdomains (archive.vn, archive.fo, etc)