If there is nothing like this, I'll probably write and release it for our software, but it could work for any software.
The background to this is that PHP powers 80% of web sites, and there is a huge number of commodity hosting solutions out there.
Basically, this would be a single PHP file that people would download and install on their favorite commodity host. Upon launch, it would
1. Look at some hardcoded index of https URLs
2. Download a zip file and check the signed hash
3. If the signatures check out (There would be a minimum # of signatures required) then unzip it
4. Change the file permissions and run installer
It would have a Web interface and a CLI interface.
I just haven't seen anything that's a single PHP file download. It seems like the easiest distribution model for commodity hosts which regular joes use.
https://getcomposer.org/download/