Searching through the repository, I cannot find any mention to open source license:

1. https://github.com/SublimeText/LaTeXTools/search?utf8=%E2%9C%93&q=license&type=

By this project being on Github, I am allowed to fork it by the Github TOS (Terms Of Service). However, I am not allowed to create derivative works from it (pull requests). Meaning I cannot fork this repository, change its code and perform pull requests without the danger/liability of being prosecuted by violating the All rights reserved copyright granted by berne convention law.

Update 2022-12-29

To approve the open-source license, go to the pull-request #1570, and hit the review now button at the sidebar, as shown in the following image, and type I agree with this license for my code. as the pull-request view message:

List of users contributing to this project, which agree to open source license to their contribution:

• 1 | @5chdn | Afri/GitHub - Can it be an open source project? #1175 (comment) $315008497
• 2 | @ra | @xrayn Andre Rein/Andre Rein - Can it be an open source project? #1175 (comment) $315436254
• 3 | @antonio | @cantonios Antonio Sanchez/Antonio Sanchez - Can it be an open source project? #1175 (comment)
• 4 | @Bobo1239 | Boris Zhou/Boris Zhou - Can it be an open source project? #1175 (comment) $315062404
• 5 | @btstream | btstream/btstream - Can it be an open source project? #1175 (comment)
• 6 | @daizw | DaiZW/DaiZW
• 7 | @dfleischhacker | Daniel Fleischhacker/Daniel Fleischhacker - Can it be an open source project? #1175 (comment)
• 8 | @danschrage | danschrage/danschrage - Can it be an open source project? #1175 (comment) $314893784
• 9 | @deterenkelt | deterenkelt/GitHub
• 10 | @edoddridge | Ed Doddridge/Ed Doddridge - Can it be an open source project? #1175 (comment) $314880854
• 11 | @evandrocoan | evandrocoan/evandrocoan - Can it be an open source project? #1175 (comment) $314877908
• 12 | @flo | @PoByBolek Florian Zimmermann/Florian Zimmermann - Can it be an open source project? #1175 (comment) -$315322849
• 13 | @hanneskaeufler | Hannes Kaeufler/Hannes Kaeufler - Can it be an open source project? #1175 (comment) $314882738
• 14 | @HughParsonage | HughParsonage/GitHub - Can it be an open source project? #1175 (comment) $314945624
  [x] 15 | @huisunsh | @JimAmuro Hui Sun/Hui Sun(duplicated entry)
• 16 | @ig0774 | Ian/Ian - Can it be an open source project? #1175 (comment) $315437585
• 17 | @trukanduk | Ilya Uvarenkov/Ilya Uvarenkov - Can it be an open source project? #1175 (comment) $314908034
• 18 | @jbrooksuk | James Brooks/James Brooks - Can it be an open source project? #1175 (comment) $314997207
• 19 | @jspencer-cmm | Jeff Spencer/Ian @excetara2 /Jeffrey Spencer - Can it be an open source project? #1175 (comment) $315067793
• 20 | @jeremy | @pbnjay Jeremy Jay/Jeremy Jay - Can it be an open source project? #1175 (comment) $315186443
• 21 | @josef | @Josef-Friedrich Josef Friedrich/Josef Friedrich - Can it be an open source project? #1175 (comment) $315092011
• 22 | @eloo | Joseph Weigl/Joseph Weigl
• 23 | @jrast | Juerg Rast/Juerg Rast - Can it be an open source project? #1175 (comment) $314883248
• 24 | @lucasnanni | Lucas Nanni/Lucas Nanni - Can it be an open source project? #1175 (comment) $412076792
• 25 | @Mads86 | @mobmad Mads Mobæk/Mads Mobæk
  [] 26 | @margie | Marciano Siniscalchi/Marciano Siniscalchi duplicated entry
• 27 | @msiniscalchi | msiniscalchi/msiniscalchi Marciano Siniscalchi - Can it be an open source project? #1175 (comment) $314882674
• 28 | @git-commit | Maximilian Berger/Maximilian Berger - Can it be an open source project? #1175 (comment) $315010066
• 29 | @blowfish880 | Mikey Saugstad/GitHub @misaugstad - Can it be an open source project? #1175 (comment) $314912739
• 30 | @misaugstad | Mikey Saugstad @catch22 Michael Walter - Can it be an open source project? #1175 (comment) $315428323
  [ ] 31 | @florian | omniearth/omniearth @omniearth /Florian Mueller (duplicated entry)
• 32 | @petereichinger | Peter Eichinger/Peter Eichinger - Can it be an open source project? #1175 (comment) $315068460
• 33 | @pkazmierczak | Piotr Kaźmierczak/Piotr Kaźmierczak - Can it be an open source project? #1175 (comment) $314888226
• 34 | @rlerm | Rafael Lerm/Rafael Lerm - Can it be an open source project? #1175 (comment) $314942257
• 35 | @i | @LazarusX Ray Fang/Ray Fang - Can it be an open source project? #1175 (comment) $315264046
• 36 | @r-stein | Richard Stein/Richard Stein - Can it be an open source project? #1175 (comment) $314671922
• 37 | @skuroda | Scott Kuroda/Scott Kuroda - Can it be an open source project? #1175 (comment) $316764212
• 38 | @interestinglythere | @szhu Sean Zhu/Sean Zhu - Can it be an open source project? #1175 (comment) $315185499
• 39 | @faergeek | Sergey Slipchenko/Sergey Slipchenko - Can it be an open source project? #1175 (comment) $314973924
  [ ] 40 | @dozed | Stefan Ollinger/Stefan Ollinger (duplicated entry)
• 41 | @tobiasdiez | Tobias Diez/GitHub - Can it be an open source project? #1175 (comment) $314901330
• 42 | @royalts | Tobias Schmidt/Tobias Schmidt - Can it be an open source project? #1175 (comment) $314878525
• 43 | @UlrichThomasGabor | Ulrich Gabor/Ulrich Gabor - Can it be an open source project? #1175 (comment) $314888596
• 44 | @cwwwu | Wallace Wu/Wallace Wu - Can it be an open source project? #1175 (comment) $314885204
• 45 | @westacular | Wes Campaigne/Wes Campaigne - Can it be an open source project? #1175 (comment) $314898238
• 46 | @williamledoux | William Ledoux/William Ledoux - Can it be an open source project? #1175 (comment) $314898342
• 47 | @nanoant | Adam Strzelecki - Math preview: Add current tex dir to search path #1179 (comment) $316815109
• 48 | @hadisfr | Hadi Safari - Can it be an open source project? #1175 (comment)
  • 27519ca handle UnicodeDecodeError in cwls
  • 3a65bf0 add support of #include: in cwl files
  • 7fd465a fix some pep8 incompatibilities
  • 80e78f7 Merge branch 'version4' into enhance_cwl_support
• 49 | @dozed | Stefan Ollinger - Can it be an open source project? #1175 (comment)
  • ef86e75 Added linux configuration and fix for ctypes exception.
  • aa52701 Added linux default keymap.
  • 5b33ba3 Re-added ctypes import.
• 50 | @crypto-jeronimo | Crypto Jerônimo - Can it be an open source project? #1175 (comment)
  • 27b944b Fix typos, spelling and remove extra whitespace.
  • 340cfa4 More typo fixes, spelling and removal of extra whitespace.
• 51 | @vqv | Vince Vu - Can it be an open source project? #1175 (comment)
  • 6fe2473 Added command for toggling starred version of surrounding environment
  • 2284c09 Added check for empty new_regions and safe detection of star. ...
• 52 | @AllanLRH | Allan L. R. Hansen - Can it be an open source project? #1175 (comment)
  • a7c301e Added github-links to the .sublime-completions
• 53 | @charlesbaynham | Charles Baynham - Can it be an open source project? #1175 (comment)
  • 16ec7bf Fix bug where unfinished lines were not being detected
• 54 | @ericjtaylor | Eric Taylor - Can it be an open source project? #1175 (comment)
  • 089ad59 Fixed a small typo in the install docs (Fixed a small typo in the install docs Fixed a small typo in the install docs #1510)
• 55 | @JimAmuro | Hui Sun -
  • 2c0ecee fix trigger toggle for \epsilon and \varepsilon
• 56 | @randy3k | Randy Lai - Created the LICENSE as represented on the github issue #1175 #1570 (comment)
  • 7f5a783 blackslash is now handled correctly in sublime text 4 (blackslash is now handled correctly in sublime text 4 blackslash is now handled correctly in sublime text 4 #1454)
• 57 | @rensbaardman | Rens Baardman - Can it be an open source project? #1175 (comment)
  • b27fc39 Fix error message when jumping to pdf from non-.tex-file (Fix error message when jumping to pdf from non-.tex-file Fix error message when jumping to pdf from non-.tex-file #1472)
• 58 | @ssnl | Tongzhou Wang - Can it be an open source project? #1175 (comment)
  • f6c0dbe copy_on_build should not fail on nonexistent extensions (copy_on_build should not fail on nonexistent extensions copy_on_build should not fail on nonexistent extensions #1502)
• 59 | @assombrance | assombrance - Can it be an open source project? #1175 (comment)
  • 21d3bcc typo fix for subscript snippet (typo fix for subscript snippet typo fix for subscript snippet #1534)
• 60 | @daviehh | david - Can it be an open source project? #1175 (comment)
  • 6a4ca21 fix parsing for "Incomplete \if...; all text was ignored after line"
• 61 | @omniearth | Florian Mueller -
  • 7c0b8db Added snippets for creating a figure and for a table, as well as completions for the Beamer package
• 62 | @victorkwan | victorkwan - Can it be an open source project? #1175 (comment)
  • edaa630 Update README.markdown (Fixes a typo in the README. Fixes a typo in the README. #1306)
• 63 | @wdyggh | wdyggh -
  • 45e428d Fix an encoding issue when looking for ImageMagick (Fix an encoding issue when looking for ImageMagick Fix an encoding issue when looking for ImageMagick #1515)

Update

When I ran the command I got not all names correctly, so I tried to manually fix it, but seems I made some mistakes. This is the original output:

git log --pretty="%an/%cn, %ae/%cn" | sort | uniq
 1. Afri/GitHub, 5chdn<at>users.noreply.github.com/GitHub
 2. Andre Rein/Andre Rein, ra<at>ra23.net/Andre Rein
 3. Antonio Sanchez/Antonio Sanchez, antonio<at>panthera.ca/Antonio Sanchez
 4. Antonio Sánchez/Antonio Sánchez, antonio<at>panthera.ca/Antonio Sánchez
 5. Boris Zhou/Boris Zhou, bobo1239<at>web.de/Boris Zhou
 6. btstream/btstream, btstream<at>gmail.com/btstream
 7. btstream/btstream, btstream<at>hotmail.com/btstream
 8. btstream/Ian, btstream<at>gmail.com/Ian
 9. DaiZW/DaiZW, nonnullpointer<at>gmail.com/DaiZW
10. Daniel Fleischhacker/Daniel Fleischhacker, fleischhacker.daniel<at>gmail.com/Daniel Fleischhacker
11. danschrage/danschrage, danschrage<at>gmail.com/danschrage
12. deterenkelt/GitHub, deterenkelt<at>users.noreply.github.com/GitHub
13. Ed Doddridge/Ed Doddridge, edoddridge<at>gmail.com/Ed Doddridge
14. evandrocoan/evandrocoan, evandrocoan<at>hotmail.com/evandrocoan
15. Florian Zimmermann/Florian Zimmermann, flo<at>chaos-wg.net/Florian Zimmermann
16. Hannes Kaeufler/Hannes Kaeufler, hannes.kaeufler<at>gmail.com/Hannes Kaeufler
17. HughParsonage/GitHub, hugh.parsonage<at>gmail.com/GitHub
18. Hui Sun/Hui Sun, sunhuijim<at>gmail.com/Hui Sun
19. Ian/Ian, ig0774<at>gmail.com/Ian
20. ig0774/GitHub, ig0774<at>users.noreply.github.com/GitHub
21. ig0774/ig0774, ig0774<at>users.noreply.github.com/ig0774
22. Ilya Uvarenkov/Ilya Uvarenkov, trukanduk<at>gmail.com/Ilya Uvarenkov
23. James Brooks/James Brooks, ukjbrooks<at>gmail.com/James Brooks
24. Jeff Spencer/Ian, jeffspencerd<at>gmail.com/Ian
25. Jeremy Jay/Jeremy Jay, jeremy<at>pbnjay.com/Jeremy Jay
26. Josef Friedrich/Josef Friedrich, josef<at>friedrich.rocks/Josef Friedrich
27. Joseph Weigl/Joseph Weigl, joseph.weigl<at>gmail.com/Joseph Weigl
28. Juerg Rast/Juerg Rast, juergr<at>gmail.com/Juerg Rast
29. Lucas Nanni/Lucas Nanni, lucasnanni<at>gmail.com/Lucas Nanni
30. Mads Mobæk/Mads Mobæk, mads86<at>gmail.com/Mads Mobæk
31. Marciano Siniscalchi/Marciano Siniscalchi, margie<at>Marcianos-MacBook-Pro.local/Marciano Siniscalchi
32. Marciano Siniscalchi/Marciano Siniscalchi, msiniscalchi<at>gmail.com/Marciano Siniscalchi
33. Marciano Siniscalchi/Richard Stein, msiniscalchi<at>gmail.com/Richard Stein
34. Maximilian Berger/Maximilian Berger, snowdragon92<at>gmail.com/Maximilian Berger
35. Michael Walter/GitHub, michael.walter<at>gmail.com/GitHub
36. Mikey Saugstad/GitHub, michaelssaugstad<at>gmail.com/GitHub
37. msiniscalchi/msiniscalchi, msiniscalchi<at>gmail.com/msiniscalchi
38. omniearth/omniearth, florian<at>slurm.(none)/omniearth
39. Peter Eichinger/Peter Eichinger, peter.eichinger<at>gmail.com/Peter Eichinger
40. Piotr Kaz´mierczak/Piotr Kaz´mierczak, piotrkazmierczak<at>me.com/Piotr Kaz´mierczak
41. Rafael Lerm/Rafael Lerm, rafaellerm<at>gmail.com/Rafael Lerm
42. Ray Fang/Ray Fang, i<at>lazarusx.com/Ray Fang
43. Richard Stein/GitHub, r-stein.github<at>web.de/GitHub
44. Richard Stein/Richard Stein, r-stein.github<at>web.de/Richard Stein
45. Scott Kuroda/Scott Kuroda, scott.kuroda<at>gmail.com/Scott Kuroda
46. Sean Zhu/Sean Zhu, interestinglythere<at>gmail.com/Sean Zhu
47. Sergey Slipchenko/Sergey Slipchenko, faergeek<at>gmail.com/Sergey Slipchenko
48. Stefan Ollinger/Stefan Ollinger, Stefan.Ollinger<at>gmx.de/Stefan Ollinger
49. Tobias Diez/GitHub, tobiasdiez<at>gmx.de/GitHub
50. Tobias Schmidt/Tobias Schmidt, royalts<at>gmail.com/Tobias Schmidt
51. Ulrich Gabor/Ulrich Gabor, ulrich.thomas.gabor<at>googlemail.com/Ulrich Gabor
52. Wallace Wu/Wallace Wu, cwwwu<at>uwaterloo.ca/Wallace Wu
53. Wes Campaigne/Wes Campaigne, westacular<at>gmail.com/Wes Campaigne
54. William Ledoux/William Ledoux, william.ledoux<at>gmail.com/William Ledoux
55. williamledoux/williamledoux, william.ledoux<at>gmail.com/williamledoux

So far, the names I mistake were:

I am applying a Hooray to each reply I already counted/looked into and fixed the mistake.

Update 2

License suggestion copied from the files:

1. SublimeText/LaTeXTools/latextools_utils/quickpanel.py
2. alliedmodders/amxmodx/public/licenses/LICENSE.txt

This repository do not need to be under this license only. If you do not agree with, we can license you contribution under the license you would like.

The MIT License (MIT)

Copyright (c) 2017 LaTeXTools Contributors

Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files
(the "Software"), to deal in the Software without restriction,
including without limitation the rights to use, copy, modify, merge,
publish, distribute, sublicense, and/or sell copies of the Software,
and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:

The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Some components of LaTeXTools use a license other than the MIT License (MIT)
License. You must also adhere to these additional licenses in all respects. 
Each one of these files will declare under which license they are protected.

Changelog:

• After @ig0774 Can it be an open source project? #1175 (comment), changed the Sublime Text to LaTeXTools Contributors.