MacPorts is a great alternative, also way older but never has been as successful as Homebrew.
It predates Homebrew by a bit and is under Apple's http://www.macosforge.org umbrella of OSS projects, so as close to 1st party support as you can get.
Another excellent alternative is pkgsrc: https://pkgsrc.smartos.org/install-on-macos/
I've used pkgsrc on SmartOS/illumos and NetBSD for many years, but this is my first time using it on macOS -- about 18 months now, and all experiences positive!