this repository is only a "frontend" to the archived GTAModding/re3 repository (few days before it got a DMCA notice)
not every link is going to be functional though, especially if you're planning to download files from it
[master] branch: http://web.archive.org/web/20210906122254/https://github.com/GTAmodding/re3/tree/master/
[lcs] branch: http://web.archive.org/web/20210904113918/https://github.com/GTAmodding/re3/tree/lcs
[miami] branch: http://web.archive.org/web/20210906122256/https://github.com/GTAmodding/re3/tree/miami/
re3 (master branch):
re3 (miami branch):
re3 (lcs - liberty city stories branch):
this is a "fork of a fork" repository that's still up: https://github.com/Hezkore/hez-gta-re3
there are many others, but you can just search for them