- https://youtube-dl.org (still up, has executables and source)
- https://youtube-dl.org/latest
- https://web.archive.org/web/20201019113254/https://github.com/ytdl-org/youtube-dl/issues - snapshot of oficial repo before takedown, contains the issues and pull requests
- https://source.netsyms.com/Mirrors/l1ving_youtube-dl
- https://git.datahoarder.dev/whalehub/l1ving_youtube-dl
- https://gitea.datahoarding.agency/ZenulAbidin/youtube-dl
- https://youtube-dl-sources.org - awesome list of official and unofficial forks, mirrors and backups
Recently I found this helpful website: https://youtube-dl-sources.org
For now I recommend to stick with official sources as they are still available on the official website.