My new build server is now online for a few weeks. It compiles once per day the latest version of FFmpeg, FFprobe and FFplay. In addition to this, it uses commonly used codecs (like x264 and x265). The source code is also published here.
You can download the static build binary or use using an installer (macOS only). The installer is also signed and notarized, so it can be installed on macOS without any gatekeeper trouble.
Check out the precompiled FFmpeg, FFprobe and FFplay binaries